Hangouts
Free
Hangouts is an instant messaging software developed by Google.
Jitsi
Open Source
Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.
Glip
Freemium
Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.
Wire
Free
Wire is a cross-platform, encrypted instant messaging client created by Wire Swiss. It is available for iOS, Android, Linux, Windows, macOS and Web browser cl…
Matrix.org
Open Source
Matrix is an open protocol for real-time communication. It is designed to allow users with accounts at one communications service provider to communicate with…
Hibox
Freemium
Hibox provides task management, business chat and video calls.
Yammer
Commercial
Yammer is a freemium enterprise social networking service used for private communication within organizations.
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…
Jostle
Commercial
Jostle is a people engagement platform mainly focused on employee engagement.
kune
Open Source
kune is a distributed social network software.
Dialog Messenger
Free Personal
Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.
Hack Chat
Open Source
Hack Chat is a minimal, distraction-free chat application.
Stackfield
Freemium
Stackfield provides end-to-end encrypted communication and collaboration with tasks, documents and projects for business teams.
Discord
Free
Discord is a freeware proprietary VoIP application designed for gaming communities.
Basecamp
Commercial
Basecamp is a project management web app.
Samepage
Freemium
eXo Platform
Commercial
eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform.
Whaller
Freemium
Whaller allows teams and organizations to create their own internal social networks, meaning no adverts and no data exploitation.
TribeScale
Free
TribeScale is an All-in-One platform to coordinate your team around what really matters - communication, goals, decisions, tasks and results.
Flock
Freemium
Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution.
Fleep
Freemium
Fleep enables communication within and across organizations, be it your team chats, project communication or 1:1 conversations.
Zulip
Open Source
Zulip is a chat and collaborative software.
Flowdock
Commercial
Flowdock is a group chat for teams which integrates with GitHub, Jira, Trello.
Gitter
Freemium
Gitter is an open source instant messaging and chat room system for developers and users of GitHub repositories.
Hubgets
Commercial
Hubgets provides chat, voice and video turning team communication.
Compare Slack with alternatives
Compare Dialog Messenger and Slack and decide which is most suitable for you.