Brain Games - Boost memory power with free brain games
Minimal Wikipedia - Minimal redesign of Wikipedia by Moe Silah
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
IKO - Initial keyword offering - pre-sale of Keywords for life.
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle
MealDB - The best restaurants and cafes nearby