A note-taking application and a to-do management system that is ridiculously simple, yet very advanced.

Track your tasks and projects in a plain text file, todo.txt. A todo.txt is software and operating system agnostic; it's searchable, portable, lightweight and easily manipulated.

Todo app that uses cognitive psychology to trick brain into completing tasks and feeling good about it

Conqu is an easy to use yet powerful task management tool designed to help you conquer your inbox and get things done. With Conqu, you can organize the tasks by criteria that makes sense to you and then find the right task to do at the right time and place.

Sentrifugo is an Open Source HRMS Tool which can be easily configured to meet your organizational needs. It's completely FREE and has no hidden costs! Sentrifugo offers you a bundle of exceptional features and modules for managing your HR processes.

Decentralized, Offline-first, Personal Information Manager (PIM) using PouchDB/CouchDB. Includes task-, note-, and contact-management, as well as journaling.

Tasque is a simple task management app (TODO list). The main window has the ability to complete a task, change the priority, change the name, and change the due date without additional property dialogs.

Due Today offers a powerful solution to organize your tasks and projects using a mixture of David Allen's Getting Things Done methodology and your own organizational scheme.

By utilizing a simple and minimal usage syntax, that requires a flat learning curve, Taskbook enables you to effectively manage your tasks and notes across multiple boards from within your terminal.

Plocs makes you more successful, relaxed and happier with the help of goal-oriented planning:

Moxie is a single digital workspace with all the tools needed to start, manage and grow a freelancing business, with a built-in personalized community to help freelancers connect with others, develop and refine their craft and get help from experts.

Manage diary/note, schedule, todo, birthday, etc.