| Behaviour Algebra | ⊕ 1978 | ⊕ United Kingdom | |||
| BS12 | ⊕ 1978 | ⊕ United Kingdom | |||
| CAJOLE | ⊕ 1978 | ↓ ↑ ⊕ Business Data Processing | ⊕ United Kingdom | Westfield dataflow language | |
| CON-A | ⊕ 1978 | ↓ ↑ ⊕ On-Line | ⊕ United Kingdom | Conversational Algol | |
| CSP | ⊕ 1978 | ⊕ United Kingdom | Communicating Sequential Processes | ||
| DEMOS | ⊕ 1978 | ↓ ↑ ⊕ Specialised Languages | ⊕ Process interaction | ⊕ United Kingdom | Extensions to Simula |
| EPL | ⊕ 1978 | ↓ ↑ ⊕ Multi-purpose | ⊕ United Kingdom | Experimental Programming Language | |
| HOPE | ⊕ 1978 | ⊕ United Kingdom | |||
| LAPSE | ⊕ 1978 | ⊕ United Kingdom | Single assignment language | ||
| Lispkit Lisp | ⊕ 1978 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United Kingdom | |
| MICA | ⊕ 1978 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ United Kingdom | ||
| Network Control Language | ⊕ 1978 | ⊕ United Kingdom | Language for explicit control of networks | ||
| PPL | ⊕ 1978 | ↓ ↑ ⊕ Specialised Languages | ⊕ Pascals | ⊕ United Kingdom | portable systems language |
| Program Synthesis | ⊕ 1978 | ⊕ United Kingdom | |||
| RPL 11M | ⊕ 1978 | ⊕ United Kingdom | |||
| S-Snobol | ⊕ 1978 | ↓ ↑ ⊕ String and List Processing | ⊕ United Kingdom | Structured SNOBOL |