QOwnNotes
Free open source plain-text file markdown note taking with Nextcloud / ownCloud integration
Own your notes
All notes are stored as plain-text markdown files on your computer, no "vendor lock-in"
Private cloud support
Use Nextcloud, ownCloud or other services to work with your notes online or sync them across devices
Customization
Heavily customizable and scriptable, you are in control of on how you want to work with your notes