Zen Flowchart - The simplest tool to create flowcharts
SmallDevTools - Handy developer tools with a delightful interface
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LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
TextLab - TextLab is the fastest way to format, prettify, transform, hash, encode, and decode your data instantly!