Alternatives to Zettelkasten

Knowledge base that works on top of a local folder of plain text Markdown files

Note Taking: Nimble, Calm, Plain.txt

Native document editor

Note taking app

Hierarchical note taking application

Note taking and to-do application with synchronisation capabilities

Privacy-first, open-source platform for knowledge sharing and management

Digital note taking app

App for note taking, organising, task lists, and archiving

Personal knowledge management and note-taking app

Open-source markdown editor

Local-first personal knowledge management system