Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
ProjectPier.org : ProjectPier is a Free, Open-Source, PHP application for managing tasks, projects and teams through an intuitive web interface. It must be downloaded a...
Gather : Spend time with your friends, coworkers, and communities like you would in real life
Basecamp : Basecamp is a web-based project management tool. Its primary features are to-do lists, milestone management, forum-like messaging, file sharing, and t...
Imagine all your team communication in one place, instantly searchable, available wherever you go. That's Slack.