| Algol 48 | ⊕ 1998 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True Algol58s | ⊕ United States | McCarthy's putative theorised Algol 50 precursor |
| Algol 50 | ⊕ 1998 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | McCarthy's putative theorised Algol 60 precursor |
| Titanium | ⊕ 1998 | ↓ ↑ ⊕ Numerical Scientific | ⊕ United States | Parallel dialect of Java |