| BeBOP | ⊕ 1993 | ↓ ↑ ⊕ Experimental and other | ⊕ Australia | Object-oriented parallel logic programming language | |
| LOOPN | ⊕ 1993 | ↓ ↑ ⊕ Experimental and other | ⊕ Australia | Petri net language | |
| Progol | ⊕ 1993 | ↓ ↑ ⊕ Experimental and other | ⊕ United Kingdom | ||
| ProtoHyperflow | ⊕ 1993 | ↓ ↑ ⊕ Experimental and other | ⊕ United States | ||
| sceptic 4 | ⊕ 1993 | ↓ ↑ ⊕ Experimental and other | ⊕ United Kingdom |