Tindalos Interactive has just announced that Stellar Impact is now free to play. In order to gather more people in the game the tryout period will now last indefinitely but you will get only access to the first level of each ship.
Everybody will be able to play for free and indefinitely but ships are limited to the first level, you will have to buy a premium account to unlock the upper levels. So this is basically a bit useless for those seeking some addictive free-to-play MMO games without any kind of restrictions.
Still, it can be considered as an extended demo so if you are interested in it, go ahead and give it a try.
STELLAR IMPACT gameplay trailer