The AVGA Editor by Benjamin Vedder, written in 2009 in Java has a potential to be great tool for AVGA-compatible graphics format. It can open/save the tiles, sprites and game maps directly from/to the header files. The editor is not yet complete and buggy, for example when opening/saving a tileset with different tile count than the default. I would be very grateful if someone takes the Ben's work and makes it more complete. So far, I have only modified it for the swapped nibble order used in AVGA 2.0. If you are experienced in Java, download the sources and feel free to experiment!