Ryzom have enjoyed playing for free for the last while, it appears that the time is approaching for that to end. An announcement on the Ryzom forums indicates that they're working on changing the game back over to being under a pay-to-play monthly subscription. After initially seeing the game taken offline last year, then bouncing back, It's been a hell of a ride for the Ryzom faithful. While this most recent reincarnation seems to be doing well, only time will tell if the move back to a monthly subscription model will help it grow further in terms of new content and players or not.
That said, if you've wanted to check out Ryzom, you'd better get on the ball. From what their forum message indicates, you only have a few weeks left before its free-to-play status is history. Who knows, you might find yourself enjoying it so much that you roll to a monthly subscription when the time comes too.