The ink of my posting on WPML had hardly dried, when the makers decided it was time to turn their plugin commercial. This not only invalidated a lot of what I said then, but also made WPML a lot less attractive for new websites. Existing websites that have been built using WPML are now more or less locked in to keep using it and pay a substantial yearly fee for that.
It seems like a good idea to look for alternatives. I found a site that lists WPML itself, but also 4 alternatives to WPML:
I have to admit WPML is very professional, so I am not sure any of these four come even close to it in features and flexibility, but I intend to find out. If you have experience with any of these, please tell us by leaving a comment.