Of course, Wanderer RPG, is not, as far as I know, in production, although you just know that some DIY publisher would have a runaway OSR hit on their hands (that is, by selling at least 100 copies) if they actually published a playable version of a Traveller-based Fantasy game.
I won't rehash the genesis of this Wanderer RPG mock-up. You can find several threads talking about it on various role playing boards. Over at the OD&D board, they have a thread devoted to the creation of Wanderer RPG. There are several threads speculating on what Wanderer RPG would look like, over at RPG.net here and here. There is even a thread on the travellerrpg boards which you can find at the link here.
In a fit of nostalgia, I just broke out my old Traveller LBB's. Ah, the memories.