Open Source Workplace by Facebook Alternatives

Diaspora is a federated social networking service, designed to be a more privacy-aware alternative to Facebook . Share what you want, with whom you want.

HumHub is a free social network software and framework built to give you the tools to make teamwork easy and successful.

Our philosophy is that your data are yours and you must always be in control. Movim achieves this through a complete decentralisation of users' data and accounts.

eXo Platform is an all-in-one digital workplace solution that helps you connect, align and engage your teams around a single interface. You can use it to improve company and peer-to-peer communication, boost collaboration and manage company knowledge.

A stream server that does most of what people really want from a social network.

Libertree is free, libre, open-source software which is intended to provide a way for people to create their own social network.

Social websites go far beyond Facebook look-alikes and CB has literally hundreds of built-in features and can be extended with extra (free or commercial) add-ons from the CB Team and other parties that will help you realize your very own - tailored to your specific needs -...

Easy Redmine is a web based collaborative project management application. It is used by companies from around the world to handle projects, tasks, schedules, resource utilization, budgets, attendance monitoring, support management and much more.

Lament is a Yammer client for the Linux (Ubuntu) and the Mac OSX (>=Lion) desktop.

It's a lean web-based open source social communication platform for teams and small organizations. It combines the ideas of transparent messaging, blogging, activity streams with superior tagging and filtering into a single easy to use web interface.