That was the first thing I looked for as well. I have a service monitor (combination tracking generator and spectrum analyzer) witch CGA output. There's a fair amount of old engineering equipment with CGA out. They typically have green CRT built in, but if you do hook up an external monitor you get a rather nice color display.

Not a total loss, CGA was also also popular in cabinet arcade games. You can get converter boards. All the ones I've seen had 5-pin headers and you have to build your own cable.