This program was written because there was little support for the APNG file format, and my company was experimenting with using it in our game engine. Included in this project are an APNG data model, APNG builder and 2 APNG viewers (which use 2 rendering engines, for testing).

APNGLib.sln must be opened in either Visual Studio (2010 and up) or MonoDevelop.
From there, you can compile and run the various programs.
The viewers and builder will only work on Microsoft Windows, since they all use the Winforms library.

This program takes a root directory and traverses each subdirectory. For each subdirectory, it takes all PNG files inside and assembles them into an APNG, followed by compression with the 7Z compression algorithm. The PNGs are added as frames in alphabetical order.

Select a directory, and all PNG/APNG files are rendered. On one side, the standard (non-animated) PNG is shown, rendered by the WinForms library. On the other are the animated PNGs. This is to demonstrate that APNGs have a fallback if animation is not enabled.

Works very similar to APNGViewer, but only displays one PNG/APNG at a time, and uses OpenGL as its rendering engine (hopefully to speed the rendering process).