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We usually call it "our engine", although our CTO Ivan-Assen pushes us to come up with a proper name every two years or so... Will keep you posted if he is successful this time.

(and no, it is not Unreal Engine, it is a creation of our own)
 
Sol Engine (actually a Sun Reactor from Star Wars The Old Republic)

swtor-sun-machine-reactor-decoration_thumb.jpg