Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Dopaminite - Be more productive, find the balance between work and fun
Lightning Calendar - Organize your life — it’s about time!
Superday - Track your activities to find balance between life and work
GMinder - GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
AtTrack - First modular time tracker to improve team's productivity