SmartGit 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.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Ruby Toolbox - Explore and compare open source Ruby libraries
SourceTree - Mac and Windows client for Mercurial and Git.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.