| ABC++ | ⊕ 1994 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | Concurrent C++ |
| ABCL/c+ | ⊕ 1988 | ↓ ↑ ⊕ Experimental and other | CPL, BCPL and B | ⊕ Japan | Concurrent actor language based on C |
| AMPL | ⊕ 1983 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | Parallel variant of C |
| ARTS/C | ⊕ 1988 | ↓ ↑ ⊕ Experimental and other | CPL, BCPL and B | ⊕ Japan | |
| B | ⊕ 1970 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | Systems Programming Language |
| BCPL | ⊕ 1967 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United Kingdom | Basic CPL |
| C | ⊕ 1972 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | Unix systems programming language |
| CPL1 | ⊕ 1965 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United Kingdom | Implemented subset of CPL |
| C-XSC | ⊕ 1993 | ↓ ↑ ⊕ Specialised Languages | CPL, BCPL and B | ⊕ United States | Extensions to C++ for scientific computing |
| DISC | ⊕ 1989 | ↓ ↑ ⊕ Specialised Languages | CPL, BCPL and B | ⊕ Italy | DIStributed C |
| Eh | ⊕ 1976 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ Canada | Portable systems language from Waterloo |
| Hybrid | ⊕ 1987 | ↓ ↑ ⊕ Experimental and other | CPL, BCPL and B | ⊕ Switzerland | |
| IMP | ⊕ 1970 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | Extension of B with floating point |
| LADY | ⊕ 1984 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ Germany | System language for INCAS |
| MCPL | ⊕ 1999 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United Kingdom | Matching CPL |
| MIDL | ⊕ 1977 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | Systems implementation language |
| Paralation C | ⊕ 1989 | ↓ ↑ ⊕ Specialised Languages | CPL, BCPL and B | ⊕ United States | |
| PROMAL | ⊕ 1986 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ United States | |
| Real-Time Concurrent C | ⊕ 1991 | ↓ ↑ ⊕ Experimental and other | CPL, BCPL and B | ⊕ United States | Real-time extensions to Concurrent C |
| Zed | ⊕ 1978 | ↓ ↑ ⊕ Multi-purpose | CPL, BCPL and B | ⊕ Canada | Waterloo portable systems language |