Jira may be extremely sluggish and require a large amount of memory on the client side.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
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.
Lightning Calendar - Organize your life — it’s about time!
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
GMinder - GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.