I don't know what everyone else here has been doing with themselves, I don't even know if anyone will remember me, but in my time I've been working on my own game engine in C#
https://www.youtube.com/watch?v=LSEuVuCuiCI
Here's a game that controls (will control) like Smash Bros. Melee, but will be structured like The Binding of Isaac (or a generic rogue like). I had the idea when I got bored of Isaac because its controls are boring. Also designed for multiplayer.
C# is a language I highly recommend. XNA/Monogame feels like an environment that gives you just enough control to give exactly what you want while not overwhelming you with menial things.
Aside from that a couple days ago I started on a 2d sprite animation program that's coming along smoothly. I couldn't find a tool online that was free as well as integrating into my project without tearing apart my structure. My program uses a single class to include, that uses a single object per animation, and is drawn with a single call. Also will have basic functionality like i-frames and smoothing. I'll upload that for free when I'm done with it.