Turtl - The secure, collaborative notebook

vim-pad - Note-taking extension for Vim text editor.

OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.

Gollum - Gollum is a simple wiki system built on top of Git

CherryTree - A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

Vimwiki - Vimwiki is a personal wiki for Vim – interlinked, plain text files written in a markup language.