Slack
Freemium
Slack is a cloud-based team collaboration tool.
Glip
Freemium
Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.
Rocket.Chat
Open Source
Rocket.Chat free open source chat solution.
Voxeet
Free
Voxeet is VoIP web conferencing software that uses 3D high definition voice technology to produce immersive sound.
TribeScale
Free
TribeScale is an All-in-One platform to coordinate your team around what really matters - communication, goals, decisions, tasks and results.
Zulip
Open Source
Zulip is a chat and collaborative software.
Hack Chat
Open Source
Hack Chat is a minimal, distraction-free chat application.
Discord
Free
Discord is a freeware proprietary VoIP application designed for gaming communities.
Mattermost
Open Source
Mattermost is an open source, private cloud Slack-alternative, Workplace messaging for web, PCs and phones. MIT-licensed.
Bitrix24
Freemium
Bitrix24 is a free (for small businesses) social enterprise platform.
Whaller
Freemium
Whaller allows teams and organizations to create their own internal social networks, meaning no adverts and no data exploitation.
Grape
Commercial
Grape is an REST-like API framework for Ruby. It's designed to run on Rack or complement existing web application frameworks such as Rails and Sinatra by prov…
Dialog Messenger
Free Personal
Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.
Compare Flock with alternatives
Compare Dialog Messenger and Flock and decide which is most suitable for you.