For starters, those are servos and servo drives.
The drives are still perfectly good as far as still being usable. They do most of the same things the newer model does. I'd say they would sell for $30-50 each on ebay if taken apart. The motors probably similar value. The enclosure and power supply maybe another $100.
All told you could probably get $400-600 for the lot. There are similar collections of parts new for close to $1k so you might get more from the right buyer.
NEMA23 Servo Motor kit