HeySpace - HeySpace is the only free task and simple project management software with communication and collaboration feature.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Momentum - Agile goal and performance management
Crucial Human - Crucial Human makes software focusing on human productivity, collaboration, and learning.
Streaks - The to-do list that helps you form good habits.