Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Gitential - Analytics for Git Repositories
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project