BertieBaggio writes: I am a medical student at the end of an academic year trying to get my notes organised. I'm looking for a software document organisation system to organise a mix of text notes, journal articles, diagrams and scans. Ideally such a system would permit full-text and metadata search, multiple categorisations (eg tags), preserve the underlying files and be cross-platform (Linux/Windows/OSX). While I'm not averse to paying for such a complex solution, ideally the software would be FOSS so that extension or migration are possible if necessary. Desktop search (eg Google Desktop) probably does 90% of what I want apart from multiple categorisations, which is the feature I'm most interested in. Searching turned up a similar question over at 43folders which pointed me in the direction of Papers and DevonThink, but these are OSX only and seem to be aimed more at academic paper organisation. What recommendations does the Slashdot community have for categorising and organising a heterogeneous mix of files?