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.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Lavagna - OpenSource project management tool designed for small teams.
productboard - Beautiful and powerful product management.
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
Todox - A clean and cozy personal task manager.