Startup School - How to start a startup, by Y Combinator
Startup Toolkit - Interactive how-to guides to launch your startup
SkySilk - SkySilk Managed Cloud Services, Offers Free Cloud Resources
JumpStart Toolkit - A pack of tools and goodies to jumpstart your startup
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Electron Toolkit - Toolkit to build and launch Electron apps