Alternatives to Slack for Linux with any license

Mattermost

Mattermost is an open source, self-hosted Slack alternative. As an alternative to proprietary SaaS messaging, Mattermost brings...
- Mattermost is on-prem, secure and available on desktop, browser and mobile lindy65 • Apr 2020 • 2 agrees and 2 disagrees
- Same functionality. Same interface. At the same time, there are much fewer restrictions. IN my experience, the free version is great enough for a team of 100 people shelehovchanin • Apr 2019 • 7 agrees and 2 disagrees
- Has all the features provided by Slack plus even more and can be self hosted. wget • Apr 2020 • 2 agrees and 2 disagrees
- Allmost the same interface and features kostya • Feb 2020 • 1 agrees and 0 disagrees
- Great interface, you control your data. liger1978 • May 2020 • 0 agrees and 1 disagrees
- It's faster for one thing. It's far superior in terms of data ownership, and it's extremely scalable. Guest • Apr 2020
- Has more flexibility due to its extensive plugin system compared to other alternatives. svelle • Apr 2020
- Looks and works very much the same as Slack and complete control over your data housed separately from anyone else. Mudie • Apr 2020
- Lots of options for integrations! Guest • Apr 2020
- It covers just about every use-case with the ability to host it yourself, and the team edition should cover about all needs for smaller (~150) companies Guest • Apr 2020 • 0 agrees and 1 disagrees
- same features and ease of use. more control and costs less Guest • Apr 2020 • 0 agrees and 1 disagrees
- Open source with control over your data. jaydeland • Apr 2020 • 0 agrees and 2 disagrees
- it is similar in features, and has some more, for example XMPP compatibility (-> many more client choice) and ability to self host it! Guest • Jul 2018 • 4 agrees and 1 disagrees
- Mattermost is quite versatile and has been used within several of my past employers. Guest • May 2018 • 5 agrees and 1 disagrees
- Its the same but you keep your server where you want so no one is playing with your data, and you can have an unlimited history depending on what you need for free so really way better ! Guest • May 2017 • 5 agrees and 2 disagrees
- It is very much a Slack clone with added features + it's open source! Guest • May 2017 • 3 agrees and 3 disagrees
- 1. Open source; 2. most of the same functionality; 3. secure and private server possibilities (the data is, therefore, yours until the end of time); 4. extra features when it comes to customization, a big difference actually. Only negative is that Slack look a lot better design wise, so you can't customize it optimally. Guest • May 2017 • 1 agrees and 2 disagrees
Freemium $ $ $ Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad Self-Hosted JavaScript Go (Programming Language) Cloudron
Team Collaboration Group chat Plugins Chat Bot ... On-premises software Webhook support Data API Integrated File Sharing MarkDown support Multi Channel Plugin API File Sending Slack integration Supports XMPP Add a feature

193 Like
Discord

Discord is about giving people the power to create belonging in their lives. We want to make it easier for you to talk regularly with the people you care about. We want...
- Very very similar in terms of use and features. Of course, discord is marketed as for gamers while slack is for teams but usage is almost identical. jbrown • Feb 2020 • 10 agrees and 2 disagrees
- Slack is a project productivity and communication enhancement tool with integrating with other collaborative tools like GitHub, document editors, storage, etc. Discord is for recreational chatting. thompsonmj • Aug 2018 • 28 agrees and 16 disagrees
- Discord is much simpler to use in terms of connecting new servers/workspaces to your account, but slack has conversation threads which sometimes come in handy if a conversation is between 2 people but wants to stay in the main channel so others can reference it. 95% i would choose discord though. leyline • Oct 2020
- Discord is now rebranding to be more enterprise-friendly. It can be customised to fit your every need. Dillxn • Jul 2020
- Good app for your personal use. Wouldn't recommend for an Enterprise setting which is what Slack is more geared towards. TheBeast • Jan 2017 • 21 agrees and 7 disagrees
- Better voice quality, easier to setup and use mrlegendanny • Jan 2018 • 5 agrees and 6 disagrees
- Discord is more gamer oriented than business oriented. alexandrezanni • Jan 2018 • 6 agrees and 5 disagrees
- It's cheap and very well implemented. Audio features are perfect. It's not enterprise, obviously, but it IS definitely a reference to follow. rdlu • Jul 2018 • 0 agrees and 2 disagrees
- slack is bassicly discord, & discord has GAMING OPTIONS un like slack Guest • Jul 2018 • 0 agrees and 7 disagrees
- Great app that even supports video meetings Guest • Apr 2016 • 7 agrees and 2 disagrees
- It's basically Slack with voice support Guest • Feb 2016 • 0 agrees and 1 disagrees
- Discord is pure chat for gamers Guest • Feb 2016 • 2 agrees and 4 disagrees
Freemium $ $ $ Mac Windows Linux Web Android ... iPhone Chrome OS BSD iPad Electron / Atom Shell FreeBSD
Voice Call Group chat Ad-free Share your screen ... Video calling Chat Bot Multi Channel Text chat Voice chat Push to talk Video chat Multiple Servers Public groups chat Social & Communications Bots Custom roles Custom Smileys Direct Messaging Encrypted chat Games support modding out of the box Group Voice Chat Lightweight Low Latency Noise Reduction Reactions Role-based security access Share content Text to Speech Voice channels Camera capturing Channel manager Community based Dedicated Server Hosting Development API Electron based Gaming-focused Gui Group Messaging In-app server browser In-Game Overlay Integrated Chat Integrated File Sharing Interface Overlay Low bandwidth usage Low memory usage Night mode/Dark Theme Permission system Persistent Chat Photo Sharing Positional audio Responsive design Share your screen Single Sign-On Team Collaboration Voice chat Webcam overlays Youtube Gaming Integration Add a feature

768 Like
Element

A free instant messaging and collaboration software based on the Matrix protocol.
- Federated, decentralized, encrypted, open-source. Guest • Jul 2019 • 4 agrees and 2 disagrees
- because its open source, decentralised, and end-to-end secure. Plus the folks at matrix.org are working to get us out of our communication silos by creating standards for communication interoperability! brinerustle • Mar 2018 • 6 agrees and 2 disagrees
- Federated, free standard and free software Guest • Feb 2018 • 5 agrees and 2 disagrees
- decentralised, federated, end-to-end encrypted communication. User6044478 • Oct 2017 • 7 agrees and 0 disagrees
- It's built atop Matrix, which provides distributed, federated instant messaging, voice and video calling with the ability to bridge into other networks (IRC, etc.) lampholder • Jul 2017 • 4 agrees and 0 disagrees
- Free and opensource with better performance and features for team communication. Guest • Aug 2017 • 4 agrees and 1 disagrees
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Matrix.org Cloudron
Decentralized End-to-End Encryption Group chat Team Collaboration ... Federated Federation Privacy-friendly Encrypted chat Privacy focused Video calling Video chat Voice Call Active Directory integration Add-ons Clean design Cross-platform Custom widgets Direct Messaging Encrypted Enterprise Group collaboration LDAP support Matrix.org protocol Message redaction Mobile friendly Moderation tools Per-room avatars Read receipts Real time collaboration Self-hosted search Text chat Typing notifications User Management User mentions Version history Video/Audio Calling Video Conferencing Voice chat Web-Based Web Integaration Chat Bot Community based DRM Free GitHub integration Integrated File Sharing MarkDown support File Sending Server Moderation Server side history Slack integration Video calling Voice chat Add a feature

362 Like
Zulip

Zulip is a group chat app in which messages are threaded by topic, helping you have long-running, organized conversations. Zulip's threading makes it easy for people...
- More than feature parity with Slack, it's better because of Streams and Topics. It offer the same free tier with 10.000 max messages and better paid plans to the hosted version, and also provide the open source self-hosted option to install it on your own server and also remove the max messages limits. 5 stars paulocoghi • Feb 2020 • 3 agrees and 1 disagrees
- Zulip is open source and the methods of communications used is vastly different. It is specially useful in professional environments where different teams might want to participate in different conversations at the same time. Zulip solves this problem by including topics, where in each channel/stream, multiple topics can exist at once, at the same time. Guest • Mar 2019 • 6 agrees and 3 disagrees
- Three reasons: 1. Open source. 2. Stream 3. Topics abijith • Dec 2017 • 8 agrees and 2 disagrees
- Open Source without limitations when on premises. Much better information categorisation with Streams & Topics. Vibrant community. superbiche • Dec 2018 • 4 agrees and 1 disagrees
- The concept of topics to each message is a super useful feature :) Guest • May 2019 • 3 agrees and 1 disagrees
- It's open source, and has really good threaded conversations. aviendha1591 • Nov 2017 • 7 agrees and 0 disagrees
- One can easily switch in between conversation between different threads! Extremely helpful for any organisation. shantnukumar • Aug 2018 • 2 agrees and 0 disagrees
- Zulip offers a great unbeatable chatting experience. It shines in many places where Slack tends to slack. Sethu • Dec 2017 • 7 agrees and 0 disagrees
- It's open source and you can self host. It has great threading to group conversations so things are easier to find and more organized . Guest • Jul 2018 • 2 agrees and 0 disagrees
- Zulip is very user friendly and is also open source! linacodes • Jan 2018 • 2 agrees and 0 disagrees
- Open-source, streams, topics, quick responses from devs hrishikeshpatil • Jan 2018 • 2 agrees and 0 disagrees
- It is open source and has a lot of topics. Guest • Jan 2018 • 1 agrees and 0 disagrees
- Great community Easy Access Many organization sirepherox • Jan 2018 • 1 agrees and 0 disagrees
- Good community with great support. gamefreakerxD • Dec 2017 • 1 agrees and 0 disagrees
Free Personal $ $ $ Open Source Mac Windows Linux Web Android ... iPhone Android Tablet BSD iPad Self-Hosted
Threaded Conversations Group collaboration Group chat Chat Bot ... Chat organizer Community based GitHub integration Integrated File Sharing Live topics MarkDown support Secure Chat Team Collaboration Todos Add a feature

162 Like
Rocket.Chat

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
- Rocket.Chat comes very close to slack regarding it's core features and handling. Guest • Jun 2018 • 5 agrees and 1 disagrees
- open source, locally hosted so you own your data. Guest • Nov 2018 • 3 agrees and 3 disagrees
- Does everything Slack does AND it's open source. However, it's also self-hosted. This means you have to put in the effort to set it up, but you control your own data, which is a huge advantage to your privacy - your chats and files don't sit on someone else's servers, ready for them or hackers to look at. JohnFastman • Dec 2016 • 10 agrees and 2 disagrees
Freemium $ $ $ Open Source Mac Windows Linux Self-Hosted Cloudron
Channels Group chat Ad-free Bots ... Omnichannel messaging Video chat Video Conferencing Chat Bot Extensible by Plugins/Extensions Integrated File Sharing Location Mapping Share your screen Self-Serve Capability Slack integration Voice messages Add a feature

118 Like
Matrix.org

Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of...
- Matrix is a protocol, not a client. somegirlfromit • Sep 2019 • 11 agrees and 0 disagrees
- Respects your Freedom. Increasingly popular Guest • Nov 2017 • 1 agrees and 1 disagrees
- Open source, fecentralized, federation, chat-voice-video function. User6044478 • Oct 2017
- It can be easily bridged to many other chat systems, including Slack, which makes transitioning *much* easier. It's also open source and decentralized (self-hostable + communication with other servers). Guest • Jul 2017
- Free open source instant messaging service with federation. Guest • Aug 2017 • 0 agrees and 1 disagrees
- Capable of everything Slack can do, but can be self-hosted - keeping a team's data in-house. nrg200 • Jul 2017 • 0 agrees and 1 disagrees
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted WebRTC Python JavaScript Go (Programming Language) Cloudron Java Perl
End-to-End Encryption Federation Decentralized Random video chat ... Voice Call Voice chat Chat Bot Distributed Encrypted chat Group chat Messaging Real time collaboration Server side history Team Collaboration WebRTC Add a feature

170 Like
Jitsi

Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live...
- Jitsi is for video chat, slack is a team collaboration platform. In Slack, text messages are common, in Jitsi video chat is the main focus. Guest • Jun 2020 • 3 agrees and 0 disagrees
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet BSD iPad
Video Conferencing SIP Privacy-friendly Share your screen ... Browser based Cross-platform Encryption End-to-End Encryption Live Meeting Support for Multiple protocols No download No installation required No Login Required Privacy focused SIP client Unlimited users Desktop Sharing File sharing Group chat iPhone/iPod sync Multiple Account support OTR Plugins SIP Softphone Video calling Video chat Video Conferencing Voice chat WebRTC Xmpp Add a feature

399 Like
Wire

Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most...

Free Personal Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Software as a Service (SaaS)
End-to-End Encryption Security focused Video calling Encrypted chat ... Voice Call Encrypted calls Encryption Group chat Share your screen Anonymity Integrated File Sharing Multiple Account support Photo Sharing Privacy focused Privacy Protected Private Chat Secure Chat Secure File Sharing File Sending Video calling Video chat Voice chat Voice messages WebRTC Add a feature

250 Like
Know any more alternatives to Slack?
Suggest an application to this list
AirSend

AirSend is a contextual workspace that brings all your conversations, files, notes, and to-do lists into one place so that you can get work done faster and easier.
- Free. Has all the messaging features. One on one messaging is a bit convoluted but overall it's great olgafedorova • Apr 2020 • 1 agrees and 0 disagrees
- We are this app to collaborate with our remote marketing team. The best part of this app is it brings chat, files, tasks and notes in one space. We don't need to switch between multiple apps to complete the work. khart • Mar 2020 • 1 agrees and 0 disagrees
- The best feature here is the ability to add outside organisations. So you can get one airsend org to talk to another org. Which is really awesome Marco_Rater • Apr 2020 • 2 agrees and 0 disagrees
- Just an easy to use software. No install required. Up and running in 10 minutes Softgirl • Mar 2020 • 1 agrees and 0 disagrees
- I have used Slack extensively, one thing I like very much about Airsend is the ability to manage files along with messaging. nejinv19 • Mar 2020 • 2 agrees and 0 disagrees
- Slack limits itself to specific workspaces of teams. If you want to communicate between organizations or teams, shared channels are hard to setup and manage. AirSend doesn't have those issues. mio • Mar 2020 • 2 agrees and 0 disagrees
- This is a streamlined option to collaborate with chat/task/files instead of tons of variations and options that confuse folks. Guest • Mar 2020 • 1 agrees and 0 disagrees
- AirSend does everything that Slack does, but cheaper and more easy to use. That's important to me bc #1 I'm a musician w/ not a lot of spare funds and #2 I don't want to spend a ton of time figuring out how to use something. Emmy8912 • Mar 2020 • 1 agrees and 0 disagrees
- I think the combination of communication and task/file management makes Airsend an excellent tool. They are always including new features. Best of all it is Free. thiagoao • Jul 2020
- it's a great software, free (for now) JackN • Apr 2020
- It's free. And had all the same features without the annoyance theotakuboxmarketing • Apr 2020
- The software is fantastic, and it's free JenniferES • Apr 2020
- Amazing way to collaborate and super easy to use. Guest • Apr 2020
- AirSend is great because it provides the ability to more clearly communicate (no Slack overload), and it's a more powerful file management system than Slack provides. esch89 • Feb 2020
- Airsend is awesome, first of all it's free. Secondly you have the option to add a wiki to each channels and you can also do tasks built in right in there. So what's really cool about it is that you can have a mini project manager + chat program all at once. MarcSullivan • Mar 2020 • 1 agrees and 0 disagrees
- It's got a clean interface. Doesn't have all the crazy emoticons and stuff. Just seems like a more serious product. MarinaEva • Feb 2020 • 1 agrees and 0 disagrees
- AirSend offers more feattures with less of a complex UI design. I like how AirSend has built-in task management, which helps keep track of all my assignments from school mealpeal1971 • Mar 2020
Freemium $ $ $ Mac Windows Linux Web Android ... iPhone Software as a Service (SaaS)
File management Team Collaboration Task Management File sharing ... Group chat Social & Communications File-organization Included wiki Integrated File Sharing Messaging Multiple channels Notetaking Office 365 integration Channel templates Channels Communication tracking Email integration Group collaboration Live Push Notifications Support for @mentions Public channels Public groups chat File Renaming Secure private channels Smart attachments Task assignments Team messaging Video chat Voice Call Cloud Storage Add a feature

49 Like
Microsoft Teams

Team collaboration software by Microsoft that features chat and voice & video comms.
- Same as Slack plus a lot more features cyfmonse • Oct 2019 • 3 agrees and 2 disagrees
- Integration with MS Office, and most importantly - MS Teams are FREE! sbgmailcom • Jul 2018 • 1 agrees and 2 disagrees
Freemium $ $ $ Mac Windows Linux Android iPhone ... Windows S Android Tablet iPad Microsoft Office 365
Planner Team Collaboration Access Control Azure DevOps integration ... Calendar view Google Drive integration Microsoft Office integration Noise Reduction Office 365 integration Real time collaboration Reminders Shared calendars Sharepoint integration Spreadsheets Trello integration Video chat Group chat Microsoft Office integration Team messaging Team work Video Conferencing Voice Call Add a feature

37 Like