| Creator | Language | Year Created |
| François Sudre | |
| Johann Martin Schleyer | |
| L. L. Zamenhof | |
| Waldemar Rosenberger | |
| Giuseppe Peano | |
| Louis Couturat, et al. | |
| Edgar de Wahl | |
| | Creator | Language | Year Created |
| Otto Jespersen | |
| Lancelot Hogben, et al. | |
| International Auxiliary Language Association | |
| J. R. R. Tolkien | |
| Marc Okrand | |
| Logical Language Group | |
| Sonja Elen Kisa | |
|