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.

Plover - Browser Airdrop - transfer files to anyone, any device

Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.

Starfiles - File hosting done simple

Corrello - Dashboards for agile teams using Trello

Filewatch - Find your public files, before someone else does