The first photo is of a no. 7525 milling attachment. It replaces the compound rest and lets your lathe become somewhat of a mill. There should be a couple of jaws and screws to clamp the work down (shown in the attached PDF).
Second photo look to be mostly horizontal mill cutters. No idea on the block in the lower RH corner, some sort of fixture block? Just above it might be a magnetic base for an indicator?
Third photo appears to be a faceplate for your lathe. Can't tell for sure from the angle of the photo. If it's a faceplate, it'll go on your lathe's spindle with the chuck removed. Typically used with a lathe dog for turning between centers.
Fourth photo might be some sort of angle fixture plate.
Fifth photo looks to be a boring head. Does the opposite side have a micrometer dial? The bottom should have some holes for mounting boring bars if I'm correct.
Bruce