Yes, I keep both of these around. I use them constantly for various testing tasks. (Game testing, interpreter testing, and compiler testing.)
CheapGlk is the “as minimal as it needs to be” example. RemGlk is as minimal as it can while while encoding the entire screen state (including boldface, italics, fixed-width, and the status bar contents) into a JSON message. This was great for, say, the Discord bot I mentioned in a recent thread.