Overview
Atlassian Sourcetree is a free Git and Mercurial client for Windows.
Atlassian Sourcetree is a free Git and Mercurial client for Mac.
What is Diagramo
Diagramo is pure HTML5 (canvas) flowchart software. It is open source, so anyone can take it ans use it under GPL 2.0 version.
Sources
You can find Diagramo sources on either Bitbucket (https://bitbucket.org/scriptoid/diagramo) or mirrored on GitHub (https://github.com/alexgheorghiu/diagramo.git).