Thien-Thi Nguyen wrote the programs.

The programs use data (image, font, sound, text) files,
some of which are written by others:

  - deal/png/ (32 PNG files)
    These images are snarfed from an Aisleriot source tarball.
    They are provided under GNU GPL (as is the rest of Aisleriot).

  - space-frisk/FreeSerif.ttf
    This is from the Debian Etch package "ttf-freefont",
    originally from the FreeFont Project, provided under GNU GPL.

  - space-frisk/{blue,red}ball.png
    This is from the Guile-SDL package, provided under GNU GPL.

  - unpicasso/earth.jpg
    This is from the Nano-X project, provided under GNU GPL.

  - view-vcg/data/ (33 VCG files)
    These are from the VCG package, provided under GNU GPL.

The other data files were authored by Thien-Thi Nguyen:
  - mars-rescue/maps/ (2 map and 4 path files)
  - view-vcg/V.xpm