Ether Personal Knowledge
A personal knowledge base in plain markdown files you own.
Write a journal entry a day and give the things that outlive a day a page of their own. [[Wikilinks]] tie them into a graph and every page shows what links to it. Every note is a plain .md file: free in a folder on your own machine, or encrypted end to end across your devices with Sync+.
No account is needed for a folder on your computer, or for the demo, which runs in your browser on any device and is stored only there. Sync+ is the one paid plan, with a free trial.
Source-available EtherPK Client on GitHub