yEd
draw.io
LucidChart
OmniGraffle
PlantUML
Dia
UMLGraph
Gliffy
SmartGit
GitKraken
SourceTree
GitHub Desktop
TortoiseGit
Fork
tig
git-cola
yEd
SmartGitSmartGit is ideal for software developers, DevOps professionals, and anyone who frequently works with Git version control systems. It is particularly useful for those who need a GUI-based solution to manage and visualize their repository workflows.
draw.io - Online diagramming application
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
SourceTree - Mac and Windows client for Mercurial and Git.
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.