QOwnNotes

A fast notes app whose notes are stored as ordinary Markdown files in a folder on your computer, so there is no dependence on a closed format. It works with Nextcloud and ownCloud for syncing between devices and for to-do lists, can encrypt notes with AES-256 and can be customised with scripts. A browser extension saves snippets from websites. It suits anyone who wants a private work notebook under their own control, without a company cloud.