Slack is described as 'Facilitates teams' real-time collaboration with versatile chat interface and advanced search in configurable channels across multiple platforms' and is a leading Group Chat app in the social & communications category. There are more than 100 alternatives to Slack for a variety of platforms, including Web-based, Android, iPhone, Windows and Mac apps. The best Slack alternative is Zulip. It's not free, so if you're looking for a free alternative, you could try Zulip or Element. Other great apps like Slack are Rocket.Chat, Discord, Matrix and Trello.
With Instaforum, you can build a forum website that's as simple and usable as a modern messaging app. It can be public or private, and users don't have to install anything. It's easy to set up, runs on your domain with your branding, and you control your data.
United Kingdom
Mostlymatter is a fork of Mattermost meant to remove the users and messages limits. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle.
A bird's eye view of everything that matters to you, be it your personal to-do's, team tasks or projects. As a project monitoring tool, Zapty also allows organizing and planning around more sophisticated projects, sharing, proofing, collaborating, and managing documents...
United States
Team communication without the noise and distraction of instant messaging. Messages are sent on a fixed two hour schedule, giving plenty of time to get into deep work and flow.
Kontxt is an inline communication and engagement tool that adds live collaboration and interactivity to digital content. Enterprise productivity. Remote education. Site owner revenue. Personal social news aggregation, rating, sharing, and discussion.
United States
GitChat is a free, open-source IDE extension that brings real-time developer chat, GitHub-based social networking, and repo community channels into VS Code, Cursor, and compatible editors - without leaving your coding environment.
Communication without limits. The modern chat platform with servers, channels, direct messages and passwordless magic login.
Chile
AstraChat is a standalone and lightweight Jabber (XMPP) client application for mobile and desktop that connects directly to your XMPP server without any proxies in-between.
United States
Twake Chat is a secure, open source messaging platform designed for enterprises. It offers seamless integration of chat, video conferencing, file sharing, and email, and more.
France
EU
United States
Online team collaboration - secure video conferencing, document sharing, chat, e-signing, expense tracking. Free and paid subscription.
Branded platform combining customizable community spaces, event scheduling, course management with video hosting, interactive discussions, AI moderation, member directories, gamified engagement, payment processing, advanced analytics, and automated notifications.
United States
