ABEBooks.com - HomeBase 
Free software for the PC or the Mac, enabling you to manage your bookstore. Designed for those stores specializing in used, out of print, rare and antiquarian books.
http://www.abebooks.com/docs/homebase/BookHound
Database and sales management tool for independent booksellers. For Macintosh and Windows. Built with FileMaker Pro.
http://bibliopolis.com/cgi-bin/biblio/bookhound/
BookRouter
An online data converter and forwarder which enables booksellers to control online inventories with a single upload.
http://www.bookrouter.com/
BookScoutPRO
Software allows user to look up current book sale prices at sites such as Amazon.com, using cell phone or PDA.
http://www.bookscoutpro.com
