Multiplayer Bluetooth controllers adapter for retro video game consoles
I got my BlueRetro  project which is and universal BT controller adapter for retro console.
I'm making a pretty bad job monetizing this TBH. I originally wanted to sell the HW myself but turn out that with real job + young family with the little energy and time left I can't do more than "here's the code".
Turn out a few makers pick it up and are nice enough to give me a cut on their sales. Adding user donation I maybe made 2K out of it this year, not much but better than nothing I guess.
I wrote a retrospective about the last three year working in this if you like more detail 
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A C# application to encrypt existing PDF documents
I built PDFEncrypt (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. 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. This has been a very fun side project and good practice coding in C#.
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