VisualSitemaps - Autogenerate visual sitemaps in seconds.
Codefield - Tools for developers, designers and photographers
Codrops Blueprints - Free website concepts ready to implement or modify
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.
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.