imo you could do everything possible in python in ruby too

about the speed, pure ruby code maybe slow but you can powerup it with 
C-exts like in python

with the right bindings you could make desktop applications for GTK or 
for QT (or use wxwidgets)

you could make 2D Games and also 3D games


for both kind (applications and Games) i currently make new ruby 
bindings, but they are not finish yet

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