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:
Modified some objects to be more similar to Atari Robbo
Added 19 level packs
Added preliminary music support
Added sound and sound-skin support
Added support for tiled level background images
Added Oily graphical skin
Added support for Robbo Millenium objects
Added Playstation PSP support
Added Russian translation by Alexander Voikov
Added an in-game pointer control pad and toolbar
Added extensive pointer support for menus and game
Source: http://www.gp32x.com/board/index.php?showtopic=50794