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OpenSim is a Second Life-compatible open source region simulator. It's companion project, OpenGridServices, provides the infrastructure for setting up a grid of simulators.
The OpenMetaverse project is a collection of building blocks to construct the next generation of virtual world platforms on. Born out of the libsecondlife project, it contains a reimplementation of the Linden Lab Second Life protocol, and will host future metaverse implementations and enhancements as well as examples and documentation.
OpenViewer is a Second Life-compatible virtual world client.
SLeek is a relatively lightweight client for connecting to Second Life, a virtual environment by Linden Lab. It makes use of libsecondlife, an open-source .NET class library for interfacing with the SL network protocol.
SLeek itself is written in C# and .NET Framework 2.0.