Evernote is not available as a self-hosted solution but there are a few alternatives for power users and business that want to host a solution on-premise. The best Self-Hosted Journaling App alternative is Logseq, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 50 alternatives to Evernote, but unfortunately only two of them are Journaling Apps available as a self-hosted solution. If you can't find an alternative you can try to remove all filters.
Local-first, privacy-focused notebook supporting Markdown and Emacs Org mode. Offers offline use, encrypted backups, plugin extensibility, LaTeX support, real-time collaboration, and hierarchical organization for personal knowledge management.
TiddlyWiki is a single html file with all the characteristics of a wiki - including all of the functionality (including editing, saving, tagging and searching) and the style sheet. Because its a single file, its very portable - you can email it, put it on a web server or share...
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Although the approach is different, it is an alternative for other platforms in regards to note-taking in which Evernote does not cover (self-hosting mostly).