llsd-js - JavaScript LLSD implementation, last update in 2011.

Linux, Windows, MacOS, Android Compatible.

JOpenMetaverse - Java LLSD implementation, last updated 2012.llsd-java - Java LLSD implementation by Xugu Madison, last update ca 2014.Used internally by Second Life developers. Incomplete, supports XML serialization only. llsd-perl-new - Perl LLSD implementation.llsd-cpp - C++ LLSD implementation, last updated in 2010.llbase-py - Python LLSD implementation.libopenmetaverse - C# LLSD implementation.These are open source libraries for building viewers, clients, and tools that can connect to OpenSimulator. Mobile Grid Client - A Second Life and OpenSimulator messaging client for your Android powered device (mobile phone, cell phone, tablet.).Useful on systems with low specifications or for bringing an alt (alternate avatar) online without having your main avatar log out, or to quickly take care of messages, inventory, etc. The function of these viewers however is to connect to a grid, chat, manage inventory, etc. These are lightweight viewers, which either do not offer a graphical component or where the graphical component is not used by default. Forked from Linden lab Second Life viewer. Alchemy Viewer - C++ based viewer for Linux/Mac/Win.With a simplified UI more suitable to just visit worlds, rather than building (but the full UI is still accessible). Scenegate - C++ based viewer with a focus on accessibility and onboarding.Radegast Metaverse Client - Radegast-ng is Light client, evolution of Radagast from libopenmetaverae project.Cool VL Viewer - C++ based viewer for Linux/Mac/Win.Dayturn source code available on Bitbucket. Dayturn - C++ based viewer for Win/Mac only.

Firestorm VR Mod - A modification to the Firestorm Vierwer to allow use of a Virtual Reality Head Mounted Display (VR HMD).Currently the most widely used viewer on Second Life. FireStorm Viewer - C++ based viewer for Linux/Mac/Win.In this case you should consult the support of your grid or chosen viewer.

To connect to an older version of OpenSimulator, you may need to use an older version of your favourite viewer, which also could limit Hypergrid capability. Since OpenSimulator and viewers development is done by different teams with different timing and even goals, compatibility can not be assured.

Black dragon viewer for mac