- open source, with a community following ; the kind of stuff slashdotters would prefer
- tidy software architecture; simple things should remain simple
- allow open API allowing usage across many languages (say: Python & Java)
- clear licensing status, not estranging future commercial use
- serious multilingual & font support
- PDF-handling rich features, not limiting usage for invoicing, e-commerce, reports & data mining
- digital signing should not go against other features
I'd like to poll the collective slashdot crowd wisdom about if/which PDF related libraries, they have written software with, keeps them happy for *all* the above reasons. And if not happy with that all, what do they thing is the best bet for learning one piece of software in the area, with great reusability across different circumstances and little need for extra hacks?
ROTG is not at all a good answer; I'd really like to hear the smoked out war stories. It is easy to obtain a list of such libraries, yet tricky to understand how many obtained success with them!