The Collectibles Database from J. Phillip, Inc. This one is designed to track specific lines of collectibles and provide current market values as a periodic update. There is not a module for Halcyon Days but you can use the software without it.
Collectibles Organizer Deluxe from Primasoft. Windows-based. Free trial download.
The Collectors FastTrack Cataloging and Inventory Software "NBV" (TM)
Collection Master III from Nortica Technologies. Seems to have a lot of features at a great price.
Collectorpro Collection Edition