Brain Games - Boost memory power with free brain games
Mapped In Israel - An Interactive map of the Israeli startup community
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Startups List - Collections of the best startups in different places
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle
SocialGeek - Startup news for the Spanish-speaking world