Coverity Scan - Find and fix defects in your Java, C/C++ or C# open source project for free
Tuti - Create beautiful online presentations and flashcards
SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
IdeaOnce - IdeaOnce is a FREE Graphic Designing platform that helps both professional and non-designers create amazing designs easily and quickly.
Embold.io - Peer Code Review
Premast - Create presentations like never before