Long ago, I was working for a consulting agency that had an in-house .net CMS. There was a lot of ceremony involved with creating the management pieces of the system - so much so that it could take weeks just to configure what was essentially boilerplate CRUD code. At the beginning of every project there were weeks of copy-pasting boilerplate code from other projects and discovering version issues. Rinse and repeat. It was painful and time consuming.
Catalyst was a tool I created to cut down on this boilerplate. It allowed us to generate the code we needed using the database schema. We went from spending weeks on boilerplate to watching it all be auto-generated.
This was the first developer tool that I created, and it was deeply rewarding to watch the people I work with become more productive.