Catplus?

Edit: Yandex can search for it! But doesn't seem to find anything relevant.

(It also hates such queries and will force you to wait 2 minutes for a captcha to load.. but you get the results after a long wait! As our forefathers once did!)

I did find C@ and C@++ though.

https://esolangs.org/wiki/C@%2B%2B