Unfortunately (I am the first disappointed), this is not possible to have ETNA for Mac or Linux, because it is developped in PureBasic and uses dll.
ETNA will be multiplateform when Blitzmax will be multithreaded ;-) (which is not for tomorrow I believe)
ETNA will be multiplateform when Blitzmax will be multithreaded ;-) (which is not for tomorrow I believe)