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
Corrello - Dashboards for agile teams using Trello
LayAuto - Automated window management for Mac ✨
Toby for Teams - Better bookmarks, now with collaboration baked in 🔖
Slidepad - iPad style multitasking on your Mac