UXTesting - Discover how your mobile users feel
Tower - Build Better Software. Over 100,000 developers and designers are more productive with Tower - the most powerful Git client for Mac and Windows.
Startup Timelines - How the frontpages of famous startups changed over time
Git Sketch Plugin - Version control for designers
Really Good UX - A library of screenshots for UX inspiration
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.