freelancer features artificial gravity and never explains it ( stills of hangars, bars etc. ) - like star trek or star wars - no one really cares how its achieved, its just there.
regarding other technologies, freelancer isn t too advanced ( compared to other sci-fi settings )
one of the few shows that is quite consequent with gravity is babylon 5 ( the destroyers have artificial gravity by rotating their mid section ) - but the cruisers do not have - personell is "strapped" into their stations - fighters also have no gravity.
freelancer makes no use of gravity through rotation, so a logical explanation is indeed the use of maybe a very low powered and permanent tractor if you desperately seek an explanation.
mind you - when it comes to technobabble like tractor beams and beaming - the explanation is often more trivial and less exciting than one might think. - star trek features "beaming" cause it was cheaper to beam people than the creat special effects of docking / landing sequences. - artificial gravity is used, cause you don t need to create weightlessness. - both these things have been established sort of - as a "given" in most sci-fi.
so - even when freelancer wouldn t suffer from additional special effect sequences. - i believe that no one really cares about it. - its the same like we expect to hear "sound" in space - and "see" beams. its done to feel more "at home".
with that in mind - a low power tractor is as good an explanation as a superdense floorplating with its own gravity.
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