CDpedia is described as 'OS X application that lets you manage and catalogue your CD collection'. There are 2 alternatives to CDpedia for Linux and Mac. The best alternative is Tellico, which is both free and Open Source.
fennel DVDManager (aka fsDM) is our next-generation DVD manager (sic) for Mac OS X. With its clean interface, DVDManager makes maintaining your DVD library as easy as Macintosh! Quick, Simple, Easy & Fun! It's time to manage the workflow of your DVDs with Style.