Review of RPG Paper Maker powered by the Slant community.
RPG Paper Maker is open-source and free for non commercial use, and allows to create a 3D universe with many 2D sprites and even 3D objects. The engine is aimed at J-RPGs but can be used for other types of games. Also available on Steam.
SpecsUpdate
PlatformsWindows, Linux, Mac
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Pros
Pro Free
Free for non-commercial use.
Cons
Con Qt license can be expensive
Using Qt for commercial use can be very expensive.