Alternatives to Rainbow Collaboration and Communication App for all platforms with any license

Slack

Slack brings all your communication together in one place. It's real-time messaging, archiving and search for modern teams.

Freemium Mac Windows Linux Web Android ... iPhone Chrome OS Windows S BSD Electron / Atom Shell Software as a Service (SaaS)
Group chat Group collaboration Multi Channel Team Collaboration ... Extensible by Plugins/Extensions Channels App integration Channel manager Direct file uploading Electron based IFTTT integration Integrated File Sharing Live Push Notifications Support for @mentions Multiple channels Multiple teams Onboarding Out Of The Box Reactions Real time collaboration Team work Video calling Voice Call Add a feature

725 Like
HipChat

HipChat is an instant messaging service designed for companies and teams. It has persistent chat rooms, one-to-one chat, searchable chat history, file sharing via drag...
- Discontinued
  https://alternativeto.net/software/slack/ is acquiring Hipchat and https://alternativeto.net/software/stride-by-atlassian/ from Atlassian. the services will be discontinued after February 15th, 2019. https://www.atlassian.com/partnerships/slack
Freemium Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Apple Watch
Team Collaboration Integrated File Sharing Share your screen Add a feature

74 Like
Ripcord

Ripcord is a desktop chat client for group-centric services like Slack and Discord. It provides a traditional compact desktop interface designed for power users....

Free Mac Windows Linux Discord Slack
Native application Server Management Slack client Slack integration ... Slack Threads in Tabs Voice Call Add a feature

12 Like
Sblack

How is this different than Slack official client? This is not an Electron app, so its size is 20 MB instead of 180 MB. It also launches faster than the official client....

Free Mac Slack
Slack client Night mode/Dark Theme Slack integration Themes Add a feature

4 Like
Async

Async is a web application that helps small teams of software engineers have deep uninterrupted discussions and build more focused software.

Free Web
No features added Add a feature

2 Like
Plumm

Team messaging, shared emails inbox, livechat and support ticket system in one collaborative workspace.

Commercial $ $ $ Software as a Service (SaaS)
Customer support Helpdesk ticketing Live Chat Real time collaboration ... Shared inbox Team messaging Add a feature

4 Like
Carrot

When teamwork gets too noisy and overwhelming, leaders struggle to communicate effectively with their teams. With Carrot, leaders rise above the noise to communicate...

Freemium $ $ $ Web
Team Collaboration Add a feature

2 Like
Wey

Fast open source Slack desktop app, written in Node.js with native UI powered by the Yue library.

Free Open Source Mac Windows Linux
Slack client Add a feature

2 Like
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Zoho Cliq

Zoho Cliq simplifies your team communication with organized conversations, information that's easy to find and by connecting to the tools you love. Transform ideas...

Freemium $ $ $ Web Android iPhone Android Tablet iPad
Group chat Real time collaboration Social network Team Collaboration Add a feature

8 Like
Threads

Threads is a platform designed to make work more inclusive by empowering teams to discuss and make decisions at scale.

Freemium $ $ $ Web Android iPhone Android Tablet iPad
Support for Multiple threads Team Collaboration Team messaging Threaded Conversations Add a feature

1 Like