Startup Toolkit - Interactive how-to guides to launch your startup
Take The Bait - A blog about building your MVP & finding your first customer
Toolbird - Discover online tools that other startups use
Launch Library - Hundreds of resources on how to launch literally anything
Techstars Entrepreneur's Toolkit - Online resource to help you learn about entrepreneurship
Lean Canvas - Business plans take too long to write, are seldom updated, and almost never read by others but documenting your hypotheses is key. Lean Canvas solves this problem using a 1-page business model.