| FRL | ⊕ 1977 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | Frame Representation Language |
| KL-ONE | ⊕ 1977 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| UNITS | ⊕ 1977 | ↓ ↑ ⊕ Experimental and other | ⊕ Frame languages | ⊕ United States | Frame language |