I didn't make any professional Programms yet. All what i have put online(! made much more!) is a game (PONG) i made https://sourceforge.net/projects/darkbounce/ and a Lotto-Simulator (which is in German, unfortunately). I am working with GUIs, 2D/3D Graphical APIs, html, php, just started sql, ... but didnt sold anything (cuz im nice)
I was thinking of trying to sell this for around $5 when I was still working on it: https://github.com/computerquip/Teamspeak-Query-Handler
But I wasn't sure if this was 1) legal or conflicted with Teamspeak licenses in any way and 2) I didn't think it would sell at all, even if I had finished it.
I have an app coming out for Windows Phone by the end of this week. Currently in the certification process. I will post link once its in the Marketplace.