Logseq is floss(gnu license, closurescript) and almost perfect for me but it's totally mysterious to me what's stopping it from serving a web interface that serves files on the web server. It's an electron app with an HTTP API but for some reason the web demo only opens files clientside with filesystem API
Anyway, one of these days I'll fork it and make it work for me. I also have a perverted desire to change the serialization format from markdown to XML so I can manipulate the graph with other tools that talk xpath, xquery, basex.
They are doing a rewrite of the app to have a SQLite DB storage for notes instead of markdown files. I think once that is released it will be available in a web browser. Currently in alpha testing, I access the application through the browser.
Anyway, one of these days I'll fork it and make it work for me. I also have a perverted desire to change the serialization format from markdown to XML so I can manipulate the graph with other tools that talk xpath, xquery, basex.