http://www.celartem.com/en/download/djvu.asp
Check out Mendeley and Bookends, play around a little. An option might be to use Bookends for books and Mendeley for articles, to get to know both programs. Check that one can migrate later to one of the programs if needed. Check importing reference lists, from MR, from rss feeds, etc. Check how tags work. Import K-theory bibtex file. Is Bookends ok for articles? Is it easy on both programs to add all parameters one could possibly want, such as ISSN, Journal name, customized cats such as notes, conference volumes, etc. If doing manual adding of books, how fast can you find the right metadata eg via google books? Important: Can you backup all your entered data, together with the links to files?
Grapviz (http://www.graphviz.org/Home.php) har jag hört ska vara bra men det är nog mera kod som genererar ett flödesschema än ett rita-och-dra program. Gratis så man kan ju pröva det.
Annars kanske ngn av dessa: http://shapesapp.com/
Kanske mindmap-program som Mindenode eller Xmind http://www.xmind.net/?
En enkel variant online: http://www.diagram.ly/ (liknar den funktion som finns i google docs och Neooffice/openoffice)
http://www.inspiration.com/ http://www.gliffy.com/ http://dia-installer.de/
Vet inte om ngn av dessa hanterar formler mm.
Eller Flow http://ctan.mackichan.com/support/flow/flowdoc.pdf
Omnigraffle?
nLab page on Software