If you know of a Virtual World that should be listed here, don't hesitate to send us an email so that we can complete our list.
Social Worlds (MMOSG)
| Developer | RCE | Status | Remark | |
| Second Life | Linden Lab | Yes | Released | - |
| There | Makena Technologies | No | Released | - |
| HiPiHi | HiPiHi Co.,Ltd | Planned | Closed Beta | - |
| Novoking | Novoking Ltd. Co. | Planned | Private Beta | - |
Game Worlds
| Developer | RCE | Status | Remark | |
| Entropia Universe | Mindark AB | Yes | Released | - |
| EVE Online | CCP Games | No | Released | - |
Web Worlds
| Developer | RCE | Status | Remark | |
| IMVU | IMVU, Inc. | No | Released | - |
| Kaneva | Kaneva, Inc. | No | Released | - |
| Metaplace | Areae, Inc. | - | Alpha Test | - |
Virtual Earths
| Developer | RCE | Status | Remark | |
| Google Earth | No | Released | - | |
| Microsoft Virtual Earth | Microsoft | No | Released | - |
RCE = Real Cash Economy
List updated on 5 October 2007
