Top 3 Open-Source Alternatives to Pystickynote

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.

wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.

Free browser-based text editor