program for set and part administration

[Stefan Frenz]

Rebickable does most, if not all, of the features you mention.

Hmm, yes. I do like Rebrickable very much.   The second point "no Rebrickable" has two main reasons: I miss the annotating feature (at least I couldn't find it): for each set I need several structured, orthogonal fields (where is it, whom does it belong to, where on my disk are the instructions, when did I get it, etc.), and sometimes I have to be at locations without any internet, so it has to be usable offline.