Buho is a note-taking application that lets you write the computer equivalent of sticky notes.
Линвоод Буттерфли
Powerful, minimalistic, cross-platform, opensource note-taking app.
Вритеноте
Multiplatform application, currently available for linux, windows, macOS and android, which allows you to take notes in an intelligent way, you can record audio as you write, and listen to it again seeing what you have written for every second of the audio.
СимплеНоте
The simplest way to keep notes
ГТГ
(GTG) is a personal tasks and TODO-list items organizer for the GNOME desktop environment
ФеатхерНотес
Lightweight Qt5 Notes-Manager for Linux