TeamLab is a free open-source platform for business collaboration and project management. It allows you to use social networking tools such as blogs and forums, organize business tasks and milestones, as well as communicate with your team members via corporate IM.
TeamLab business collaboration platform is an open-source software. The source code is for developers and experienced users who wish to install and configure the platform manually on their own server. According to the license terms, you are free to test, evaluate, customize and improve the code.