Tiddlywiki ( http://www.tiddlywiki.com/ ) is a personal wiki that runs locally in any modern browser. You can use it on or offline and can create hypertext documents that can be shared easily or published to a web server.
There are also links for tools like xpdf, mupdf, ghostscript, a2ps, enscript, antiword and others.
I'd really like to dig up some decent Open Source OCR and HOCR applications to add to the list, but so far, haven't found anything I would recommend using. Has anyone else had better luck?
Sincerely,
Laura