Pylote is a software to draw on the computer screen and manipulate various instruments of geometry.
This is a multiplatform software, free (GNU GPL), made in Python (programming language) and PyQt for the GUI.
Pylote works with a computer screen image.
Posce (pronounced posh·ee) is a note-taking toolkit for your command line. It takes a single directory of plaintext note files and lets you create, edit, manipulate, and organise them to your heart's content; all in a single unified interface.