Pedro

"Treasure Planet" is also my favourite take on Spelljammer. No the only one, but the one that I think works best. Together with as little interaction with other settings as possible. Another nice take, for me, is a Star Wars type campaign where some "evil empire" needs to be confronted and the player characters get involved in the "rebellion". Having said that, I am not aware of any adaption to BRP. I would also be cautious with Mythras classic. While it is similar to BRP and has no levels, it has level-like features (if I remember correctly), using the brotherhoods system (or something like that) to allow player characters progress through what feels like a class system. I have not checked it in a long time so it could be that it is not as marked as I remember it though, but my feeling at the time is that it took much of the freedom that I like from BRP, and made it closer to DnD.