SmallDevTools - Handy developer tools with a delightful interface
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
whatdevsneed - This is whatdevsneed.
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.
Google Open Source - All of Googles open source projects under a single umbrella
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.