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.
Pnamur - Pnamur is a smart tool that helps you easily estimate complex projects using a top-down approach.
GoodGantt - The best Gantt chart for Trello®
Armadill.me - Free remote work reporting tool
Paws for Trello - The best way to use Trello on your desktop
Remote Work 2020 - The ultimate guide and report for remote work in 2020