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

Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.

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

UpNote - A beautiful and clean cross-platform app for notes organizer

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

Note Board - Productivity app. Save information like a sticky notes.