Amazing Marvin - Customizable personal productivity tool
Train Fitness - Automatically track your workout at the gym - hands free!
Focusmate - Distraction-free productivity via virtual coworking
MoovBuddy - An exercise app for back & neck pain and joint health
MenuTimer - MenuTimer is a timer that you can use from your menu bar.
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.