Main developer and maintainer:

Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>

Contributors:

Christian Henz  (added handling of non-encoded map data)
Dennis Honeyman (implemented the nice about dialog)
Edward Hutchins (added automatic reloading of changed tileset images)
Jeff Bland      (added Offset Map feature and fill tool)
Roderic Morris  (added many icons and initial object group support)

Translators:

Mauricio Muñoz Lucero (Spanish)
Porfírio Ribeiro      (Portuguese)
seeseekey             (German)
Thorbjørn Lindeijer   (Dutch)

The icons are from the GNOME and GIMP icon themes (GPL)