Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

UKs Kalender - This program helps you organizing your dates and tasks and reminds you of upcoming events.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.