Startup School - How to start a startup, by Y Combinator
Startup Stash - A curated directory of 400 resources & tools for startups
Owlead - Grow your Twitter with valuable followers, effortless
ProppyJS - Functional props composition for UI components (React & Vue)
Hyper Founder Program - An 8-week founder program inspired by Product Hunt
Devhints - TL;DR for developer documentation