| AGORA | ⊕ 1993 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ Belgium | Reifying prototyping OO language |
| CECIL | ⊕ 1991 | ↓ ↑ ⊕ Multi-purpose | Prototyping | ⊕ United States | Prototyped OOL |
| CEL | ⊕ 1995 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ United States | Prototyped OOL |
| Ellie | ⊕ 1990 | ↓ ↑ ⊕ Experimental and other | Prototyping | ⊕ Denmark | Distributed OO language |
| FMPL | ⊕ 1976 | ↓ ↑ ⊕ Experimental and other | Prototyping | ⊕ United States | Prototyping OOL |
| Glyphic Script | ⊕ 1994 | ↓ ↑ ⊕ Experimental and other | Prototyping | ⊕ United States | Prototype based scripting language |
| Kevo | ⊕ 1992 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ Finland | Stack and prototype-based object-oriented language |
| Merlin | ⊕ 1995 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ Brazil | Reflective dialect of Self |
| Mica | ⊕ 2002 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ United States | Prototyping OO language for MUDs |
| Moostrap | ⊕ 1995 | ↓ ↑ ⊕ Experimental and other | Prototyping | ⊕ France | |
| NeoLogo | ⊕ 1994 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ Brazil | Prototyping OO extension of Logo |
| Newton Script | ⊕ 1995 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ United States | Prototyped scripting language for the Apple Newton |
| Omega | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ Austria | Protype based OOL |
| Prothon | ⊕ 2004 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ United States | Prototyping OO dialect of Python |
| Self | ⊕ 1987 | ↓ ↑ ⊕ Specialised Languages | Prototyping | ⊕ United States | Prototyping OOPL |
| Us | ⊕ 1996 | ↓ ↑ ⊕ Experimental and other | Prototyping | ⊕ United States | Prototyping OOL |