Yes, bloodworms are the larvae of midges in the family Chironomidae, part of the "True Fly" order Diptera. The adults looks similar to mosquitos (family Culicidae) but do not bite. They are abundant in most parts of the world. Glassworms are also midge larvae, but from a different family, the Chaoboridae.
With all three families, indoor culture is difficult because of the needs of the flying adult stage. The midges are non-feeding as adults, but must have room to swarm in order to mate properly. Mosquitos of course must take blood meals before they lay their eggs. But you can get one generation at a time just by providing an outdoor egg-deposition site (the bucket I mentioned previously).
Blackworms, tubifex, and white worms are easier to culture because they are permanently aquatic.