I never see anyone talking about Tellico, but I gave it a go recently to keep track of my (quickly expanding) collection of incense and it’s been great.
I really like the ability to import and export CSV files, and the searchable HTML export is neat too.
I’m a public library user and use Tellico to keep track of books I want to read and books I’ve already read. Works great. I found an issue the other day and sent a message to the email list tellico-users@kde.org. The author is very responsive and is working on a fix. It’s a very useful application.