LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Utilso - All-in-one tools for developers
whatdevsneed - This is whatdevsneed.
SmallDevTools - Handy developer tools with a delightful interface
TextLab - TextLab is the fastest way to format, prettify, transform, hash, encode, and decode your data instantly!
Profitable writing tools database - A database of 63+ hand-curated profitable writing apps