No doubt the web page has moved on... but the 'available' field looks like a bit like a date and somehow suggests the library was/will be available on that date. A good alternative word might be 'vintage' . Among other references the Shorter Oxford english dictionary defines vintage as:
" Used with reference to the age or year of a good wine, usually connoting one of good or outstanding quality. "
... which seems to have a certain ring about it.
Vintage is also used as an adjective, and suggests "antique." Maybe "minted" or something would be better?
I'm not native English speaker. At the first sight when a newbie visits this page it seems to be easier to read/mind the word "available" - but yes it evokes something what will be available in the future. "vintage" is not bad because it resembles something unique something what he/she should remember. But if I can suggest something then it is "version", it's obvious and easy to understand. On the other hand I would change "Author(s)" to "Booster(s)" - it reminds people who boost std:: at least to me:) But maybe in English it is not possible.