Catphish - A game to play Sherlock and find out who's lying
Inkshares - Tinder for book ideas
DIY.org - Any kid anywhere can learn any skill.
Makerlog - Makerlog is the dead-simple task log that helps you stay productive and ship faster.
Little Fun Club - Birchbox for kids books, puzzles, & games
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.