Piano - Piano lets you quickly learn the piano or other musical instruments using cell phones and tablets, and also contains magic tiles and different mini-games.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Guitar - Git GUI Client. Open Source, Free Software (GPL v2). Run on Windows, macOS and Linux.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
SourceTree - Mac and Windows client for Mercurial and Git.