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What is OpenSimulator?
OpenSimulator is an open source multi-platform, multi-user 3D application server. It can be used to create a virtual environment (or world) which can be accessed through a variety of clients, on multiple protocols, see Connecting. Optional Hypergrid allow users to visit other OpenSimulator installations across the web from their 'home' installation or grid. In this way, it is the basis of a nascent distributed Metaverse.

OpenSimulator allows virtual world developers to customize their worlds using the technologies they feel work best - we've designed the framework to be easily extensible. OpenSimulator is written in C#, running both on Windows over the .NET Framework and on Unix-like machines over the Mono framework. The source code is released under a BSD License, a commercially friendly license to embed OpenSimulator in products. If you want to know about our development history, see History.

OpenSimulator can be used to simulate virtual environments similar to Second Life™. However, OpenSimulator does not aim to become a clone of the Second Life server platform. Rather, the project aims to enable innovative feature development for virtual environments and the Metaverse at large.

OpenSimulator is getting more stable over time but is still a high complex software system that can suffer various bugs and quirks; handle with care!

Features

 * Supports online, multi-user 3D environments as small as 1 simulator or as large as thousands of simulators.
 * Supports 3D virtual spaces of variable size.
 * Supports multiple clients and protocols - access the same world at the same time via multiple protocols.
 * Supports realtime, simulator side, Physics Simulation.
 * Supports clients that create 3D content in real time.
 * Supports inworld scripting using LSL/OSSL.
 * Provides unlimited ability to customize virtual world applications through the use of scene modules.

Running an OpenSimulator-Based World

 * Downloading OpenSimulator
 * Required Dependencies
 * Building OpenSimulator
 * Configuring and Running OpenSimulator
 * Server Commands
 * Frequently Asked Questions

Connecting to Worlds

 * Connecting

Participating in the OpenSimulator Community
OpenSimulator is an open source project, and is powered by the community members that devote time and energy to the effort. There are many ways to participate and contribute to the community:
 * Participate via IRC. There are channels for users and developers.
 * Participate via the Mailing Lists. There are mailing lists for OpenSimulator use and development, as well as broader topics such as education and the Hypergrid.
 * Report bugs or submit patches via our mantis bug tracker. If you're submitting code, please read through the Contributions Policy before starting.
 * Participate to open content creation for OpenSimulator. More details at Artist Home.
 * Participate in the weekly Office Hours for OpenSimulator development.

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