GNU Robbo is a free open source reimplementation of QXLand’s Robbo for the Atari XE/XL from the late 1980s. The gameplay of the original is faithfully reproduced with a few modifications.

Changes:

Added a writeable MyLevels level pack for use with the designer
Added mouse wheel support for scrolling within the designer
Added Indonesian translation by Auriza Akbar
Fixed several bugs

http://gnurobbo.sourceforge.net/