Solipsis is a free and open-source system for a massively multi-participant shared virtual world designed by Joaquin Keller and Gwendal Simon at France Télécom Research and Development Labs.
Relying on peer-to-peer architecture, the virtual world may potentially be inhabited by a theoretically unlimited number of participants.
A central objective of Solipsis is to create a virtual world which is as independent as possible from the influence of private interests, such as server ownership.
Additionally, it aims to give users more flexibility in designing interfaces and content in their individual segments of the virtual world.
The virtual world is initially empty and is only filled by entities run by end users' computers.