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.
Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
Invision - Prototyping and collaboration for design teams
pre-commit by Yelp - A framework for managing and maintaining multi-language pre-commit hooks
Sketch - Professional digital design for Mac.