The interface looks very clean. Would you mind sharing a bit about the tech behind it, assuming it isn't a proprietary secret? At first glance it looks like a C# .NET application.
It's all MFC C++ where most of the UI controls are custom ones that I created to achieve the kind of interaction I was looking for. I used LodePng and gifanimcplusplus for processing png and gif files, the rest of the code is all in-house. I learned a lot in terms of processing RGBA as fast as possible.
To be a bit more verbose: Most of the work is just processing RGBA data in terms of adding or removing pixels, or mixing it, and then pushing that to the display. So it's really just a straight up C++ app with some UI code.