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.
Google Calendar - Spend less time managing your day & more time enjoying it
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
Corrello - Dashboards for agile teams using Trello
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app