Kalisto, Echelon and ProjectX are console release groups. Echelon started out releasing games for the DC. Kalisto took over the reins in that dept. after Echelon came to an agreement with Sega to stop releasing their games.
The way I understood it, Kalisto released a lot of early Dreamcast games, then Echelon took over and stopped when Sega stopped making games. I'm talking about the Dreamcast only though.
edit: damn, I really should read the entire thread before posting...