- elvish: fan versions of finnish and gaelic
- klingon: generically "foreign" language that cribbed most of its consonant inventory from indigenous languages of the pacific northwest
- dothraki: not gonna make a joke about this one cuz i know the guy who made it lol
- toki pona: accidental auxlang that makes it equally hard for everyone to express things!
- esperanto: a polish jew put romance languages in a blender to prevent wwii from happening again
- ido: esperanto 2.0 that got forked because of drama
- ithkuil: a conlang with the cool feature that no one on the entire world can pronounce it
- loglan: conlang with no ambiguity whatsoever, so computers can definitely parse it. too bad no one speaks it
- lojban: the ido of loglan