Notepad
Notepad is a simple program for creating text notes. Free and open source programцц
Note-taking software
Simple Diary is a free and open source, simple and lightweight program for keeping a diary
oStorybook is a free and open source tool for writing fiction: novels, novellas, short stories, and screenplays
NoteCase Pro – free and open source, cross-platform software for organizing notes
CherryTree – free and open source software for creating hierarchical notes