| 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 |
| AML | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Anil | |
| ARLO | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | ||
| Bison++ | ⊕ 1998 | ⊕ United States | |||
| C++// | ⊕ 1998 | ⊕ United States | Concurrent OO Language | ||
| Catalysis | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Object modelling language | |
| Cyclone | ⊕ 1998 | ⊕ United States | |||
| FranTK | ⊕ 1998 | ⊕ United States | |||
| GJ | ⊕ 1998 | ⊕ United States | Generic Java | ||
| Half Life | ⊕ 1998 | ⊕ United States | |||
| HPC++ | ⊕ 1998 | ⊕ United States | |||
| IL | ⊕ 1998 | ⊕ United States | |||
| JML | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Interface specification language for JAVA | |
| JPF | ⊕ 1998 | ⊕ United States | |||
| M2001 | ⊕ 1998 | ⊕ United States | |||
| Oberon-XSC | ⊕ 1998 | ⊕ United States | |||
| Object-COBOL | ⊕ 1998 | ↓ ↑ ⊕ Business Data Processing | ⊕ United States | MicroFocus OO Cobol | |
| OPL | ⊕ 1998 | ⊕ United States | |||
| PROMELA ++ | ⊕ 1998 | ⊕ United States | |||
| RobotScript | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ Robotics | ⊕ United States | Scripting language for robots |
| SA-C | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Parallel C | |
| SIMPL+ | ⊕ 1998 | ⊕ United States | |||
| SmallScript | ⊕ 1998 | ⊕ United States | |||
| TAL/T | ⊕ 1998 | ⊕ United States | |||
| TDL | ⊕ 1998 | ↓ ↑ ⊕ Specialised Languages | ⊕ Robotics | ⊕ United States | |
| TINT | ⊕ 1998 | ⊕ United States | Trac variant | ||
| Titanium | ⊕ 1998 | ↓ ↑ ⊕ Numerical Scientific | ⊕ United States | Parallel dialect of Java |