| GIER Algol | ⊕ 1960 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Denmark | Naur's seminal ALGOL 60 |
| RegneCentralen ALGOL | ⊕ 1960 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Denmark | Danish family of Algol 60 languages |
| slip | ⊕ 1960 | ↓ ↑ ⊕ Specialised Languages | ⊕ Symbolic assemblers | ⊕ Denmark | Macro assembler for GIER computer |