I've found http://www.aseprite.org/ http://www.aseprite.org/ to be a reasonable alternative to DPaint. The UI is quite different, but on the other hand it has l

I've found http://www.aseprite.org/ http://www.aseprite.org/ to be a reasonable alternative to DPaint. The UI is quite different, but on the other hand it has lots of more "modern" features, like layers. Source code available under GPLv2, but you can also buy binaries.