Trigger a sound effect whenever you unlock a Steam achievement

You handle the steaming, we handle the dinging. Who the fuck wrote this slogan?

An open-source lightweight Python app that runs on the tray

It's basically just a 200 lines Python script. It's open source so you can PR the scams out.

Add your own custom sound effects just by dragging into a folder

You'll likely just add an mp3 of a fart and be done for the day.