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.
Magnet Window Manager - Magnet Developers
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
LayAuto - Automated window management for Mac ✨
Corrello - Dashboards for agile teams using Trello
Slidepad - iPad style multitasking on your Mac