I built PDFEncrypt (https://pdfencrypt.net https://pdfencrypt.net) a couple years ago based on a very simple need from a client: to encrypt PDF files via a nati

I built PDFEncrypt (https://pdfencrypt.net https://pdfencrypt.net) a couple years ago based on a very simple need from a client: to encrypt PDF files via a native Windows app, for free, without needing to upload files to a sketchy website or buy expensive software. I have been amazed at the number of visitors (4000/mo), emails, downloads, and donations the project has received. I released it as open source software, and I'm now working on V2 (almost done!) which is a complete rewrite based on user requests, as well as a bunch of new features I've dreamed up. This has been a very fun side project and good practice coding in C#.