Daybridge - A calendar built for people, not companies.
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.
Skill Lake - Organize Learning | Content Track Progress | Grow Your People
GoodGantt - The best Gantt chart for Trello®
Courselle's Learning Calendar - Manage corporate learning assignments with a visual calendar
Paws for Trello - The best way to use Trello on your desktop