Slack brings all your communication together in one place
Supercharge team collaboration with group chat and IM
Messaging for people who make software. Integrated with your team, projects and your code.
Chat-based workspace in Office 365
Open-source, self-hosted, Slack alternative
Open source slack alternative
Powerful open source team chat
Flowdock is your team's chat with a shared inbox. Teams using Flowdock react in seconds and never forget anything.
A messaging platform built for teams
Slack for the whole world, except end-to-end encrypted across all your devices
Group messaging & video meetings for teams, from Atlassian
A faster way for your team to communicate
Open source team messaging application with apps for Android, iOS, and Web
Your own business messenger.
Team collaboration with real time chat.
Slack without the annoying distractions
Open source self-hosted chat app for small teams
Real-time business chat & texting for teams
Like Slack except P2P, offline friendly, and open source
A modern and Open Source Web client for XMPP
A small alternative to Slack