Tellico was chosen as the Debian Package of the Day for January 4. The review has a lot of screenshots, and I must say, I've never heard of hyperplane arrangements before!
There are many special-purpose collection managers (most of which are listed on the tellico homepage), but tellico is one of the earlier general purpose managers. Some applications (such as GCstar) are becoming more general-purpose as they mature. Others (such as Stuffkeeper) are simply younger applications and are not yet stable. Tellico is a well-designed application and therefore can give even the special-purpose collection managers a run for their money.