[samuell]

I researched basically all the solutions (wikis, tiddlywiki, evernote etc etc), but they all had some limitation either in offline access, shareability, portability, openness or something else.

What finally made it into a working solution is writing plain markdown files, one per day, automatically synced to bitbucket via tiny bash scripts that initiate a new file for the day (aliased to 'j' for minimal hurdle to start writing), opens them in an editor, and committs to the repo after closing the editor.

It is available here: https://github.com/samuell/mdnote

The nice thing with markdown, if you make a level-1 header for each new file, is that you can concatenate the file into a long file, and run pandoc -i allnotes.md -o allnotes.epub, and get a formatted and searchable notebook for offline use, when you want to read it, with the Level-1 headings denoting chapters - so, one chapter per day!

(I have a script for this too of course: https://github.com/samuell/mdnote/blob/master/as_epub.sh).

[aldanor]

The latest TiddlyWiki is actually pretty good for this. I remember using it about a decade ago -- and I've recently started using it for various dev-related stuff, e.g. documenting how to configure this or that; it's surprisingly nice.