Startup School - How to start a startup, by Y Combinator
Owlead - Grow your Twitter with valuable followers, effortless
Electron Toolkit - Toolkit to build and launch Electron apps
Hyper Founder Program - An 8-week founder program inspired by Product Hunt
Rippling - One directory for employee information across IT, HR, legal, finance and facilities.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.