Usersnap - Usersnap is a customer feedback software for SaaS companies that need to constantly improve and grow their products.
SmallDevTools - Handy developer tools with a delightful interface
Duedot - Dossier collaboration platform
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
zipBoard - ZipBoard is a web-based visual bug tracking & issue tracking tool that helps developers, testers and project managers collaborate during website and elearning development.
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools