Krita

Krita is an open source graphics editor. It has a native layered raster graphics format called .kra or Krita document. The format uses a ZIP container, and appears to be similar to OpenRaster.

Identification
Krita documents are probably supposed to have "" at offset 30, but we've observed some that lack this signature.

Sample files

 * https://github.com/KDE/krita/tree/master/krita/data/templates/ .../*.kra

Links

 * Krita website
 * Krita History
 * KRITA Documentation: *.kra - Very minimal information about the .kra format
 * Krita