Black Blocks - Validate first.
Flare by GoDaddy - Discover, give feedback and support startup ideas
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.
Wittycircle - Networking tool for entrepreneurs, makers and curious minds.
Idea Validator - A customer development tool to help you validate your ideas before building them.
Generating Product Ideas - Find ideas for your next business or side project