I use vimwiki in combination with Dropbox and some symlinks to keep my text-only wiki portable. Useful for tech snippets and notes when I don't want to fire up

I use vimwiki in combination with Dropbox and some symlinks to keep my text-only wiki portable. Useful for tech snippets and notes when I don't want to fire up a browser... ... speaking of which: Some commenters suggest various browser-based wikis. My favourite is the JavaScript-only tiddlywiki: http://tiddlywiki.com/ http://tiddlywiki.com/ It's got bunches of plugins and compatible variants (I use the mGSD variant for GTD), so it's way more than just a wiki. I keep this in my Dropbox too, and can work on it with any browser, Windows or Linux, with or without git or any other HTTP server, online or offline.