Brain Games - Boost memory power with free brain games
ECG for Apple Watch - ECG app and irregular heart rhythm notification
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Heart for Heart - Monitor your heart in 90 seconds. For a good cause. 💓
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle
HeartIn Portable Electrocardiograph - PC/Smartphone compatible ECG. Check your heart anywhere.