I am still working on Docgoblin (https://docgoblin.com) a Pdf search engine software based on Lucene, pdfium and JavaFX. The app is super fast and users are happy with it. I'm in the process of adding plain text files support and making the website look nicer.
I'm currently working on a PDF search engine that will index and then search through several thousand pdfs. As a tabletop role-player and former researcher, I've always wanted a simple tool to do this, and I hope I won't be the only one to benefit from it. This is my first project of this scale and I hope to be able to show it here soon.
On the technical side, it's a desktop application coded entirely in java with a javaFX interface. No AI or online data uploads, just the Lucene search engine and PDFium for PDF rendering.