Startup Recipes - Learning lean startup is easy, putting it into practice is hard!Startup Recipes is It is a cheat sheet that helps idea-stage entrepreneurs to find product-market fit as quickly as possible by building minimum viable products right!
Gemoo Snap - A free "Swiss Army Knife" of screenshot tasks for startups.
TopStartups.io - Backed by investors like Sequoia, A16Z, Benchmark. See the fastest growing startups in one place.
IndiePage - All your startups, on a page
Startup Stash - A curated directory of 400 resources & tools for startups
Startup School - How to start a startup, by Y Combinator