Do you mean a router analogue of the radial arm saw or routers that operate above the workpiece, for example router skiing or pin routers or something like the youtube video I am going to try to embed?
As Tom said there are router sleds and router skis, both of which can be searched on this forum. One member attached a right angle bracket onto a radial arm saw and if I ever see a cheap radial arm drill for sale I'm going to snag it and try using it for one. There are also horizontal mounted routers and they have their own advantages in that position. Mark Sternberg I think it was also made a multi positional design which you might find on this forum (the post is a few years old) but it might be on youtube too.
I would sell it, just taking up space but if you live too far away it probably cost a fortune to ship it if you were able to pick it up probably wouldn't be a bad deal I have no idea what it's worth make me a fair offer I'd sell it
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