Next! Fitness - A.I. powered gym
Gone - An ephemeral to-do list
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Streaks - The to-do list that helps you form good habits.
Praxis - Apprenticeship program and career accelerator
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.