YouTeam - YouTeam is a new, smarter way to outsource.
Slack - A messaging app for teams who see through the Earth!
Job Board Fire - Powerful and easy to use job board software.
9mCollab - Collaborate (efficiently) Conclude (fast) Contribute (in the knowledge base)
GermanTechJobs - GermanTech Jobs is the first job board with the goal to bring more transparency, openness and diversity to the German and IT market in general.
Mattermost - Mattermost is an open source alternative to Slack.