Books
I have been using Tellico for several years to manage my library. As I didn't like the search function on the HTML pages generated by it, I created a Python program called Bonk that creates responsive HTML pages from its database with a blazingly fast search function.
Being bored easily I then decided to write my own book database software named BonkX which uses SQLite to store its data. This is currently wip, the html pages linked below are already exported by it. The current version v0.1 features Open Library and Google Books API integration, and SFTP and FTP uploads. Coming up is Europeana integration and the automatic download of cover images.