Codefield - Tools for developers, designers and photographers
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LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
SmallDevTools - Handy developer tools with a delightful interface
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools