Brain Games - Boost memory power with free brain games
Road to Scale - 300+ curated content items for every stage of your startup
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
The Stacks - A collection of PH's most popular curated lists.
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle
Quuu - Quuu is a curated content suggestion platform that connects to your Buffer queue, allowing you to grow a relevant social media following across your entire social landscape.