There is also Obsidian, which does not compete with Roam Research directly on all features (but comes pretty close), but is locally hosted. Great option for those seeking privacy of their notes and thoughts.
The thing I love about Obsidian is it's just a directory of markdown files. Still totally useful if Obsidian disappeared tomorrow.
I also just setup a cron job to daily check for changes, and if there are git commit and git push and now I can access my notes from any device with a browser.
