| GASP-FORTRAN | ⊕ 1967 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Event scheduling | ⊕ United States | |
| GERTS | ⊕ 1967 | ↓ ↑ ⊕ Specialised Languages | ⊕ Event scheduling | ⊕ United States | Graphical simulation system |
| GPSS/360 | ⊕ 1967 | ↓ ↑ ⊕ Specialised Languages | ⊕ Event scheduling | ⊕ United States | GPSS IV for the 360 |
| SIMSCRIPT II.5 | ⊕ 1967 | ↓ ↑ ⊕ Specialised Languages | ⊕ Event scheduling | ⊕ United States | Simulations package |