| NETL | ⊕ 1979 | ↓ ↑ ⊕ Experimental and other | ⊕ Frame languages | ⊕ United States | |
| PHI | ⊕ 1979 | ↓ ↑ ⊕ String and List Processing | ⊕ Frame languages | ⊕ United States | KBS |
| SNePS | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| UNIT Package | ⊕ 1979 | ↓ ↑ ⊕ String and List Processing | ⊕ Frame languages | ⊕ United States |