| ALGOL 68+ | ⊕ 1980 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL68s | ⊕ Netherlands | Superlanguage of ALGOL 68 |
| POOL | ⊕ 1980 | ⊕ Netherlands | Parallel Object-Oriented Language | ||
| SUMMER | ⊕ 1980 | ↓ ↑ ⊕ String and List Processing | ⊕ Netherlands | String and pattern language | |
| The Mathematical Vernacular | ⊕ 1980 | ⊕ Netherlands |