The lost in space robot is the B9 I believe it was also hosted here as well, but it is commercial, not free. There are a few Robbies, once commercial I believe, but all have some accuracy issues.

(Robby was in one episode, so technically he is a LIS robot, but not the one you are seeking.)

I also released a free space pod years ago as well, and lostinspaceman has a website with everything free hosted.

 

Somewhat on topic, Moebius models is releasing a 1:6 scale (gi joe sized) B9 model kit later this year, and there are also new lost in space minimate toy figures that were announced at toyfair yesterday, as well as a new robot light and sound toy.

Not that I follow it at ALL.. ;)

Way too many people take way too many things way too seriously.