If you like testing out different programs on your PC, you'll probably find a software cataloging program useful. These products not only inventory what you currently have installed but also document the different programs you've tried in the past or have moved to CD storage.
Go straight to the Quick Selection Guide
There aren't very many programs specific to cataloging software. The best known is SoftCAT Free from FNPRG.com.
They once again have a freeware version, which is available from the download link below. This version doesn't have as many features as the commercial version, but it will still meet the needs of most users.
You might want to check out these articles too: