Udon
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Udon is a C# derived object-oriented programming editor for the VRChat World SDK, created by the VRChat Development Team and released in 2018 for SDK2, then eventually SDK3. You can code traditionally using UdonSharp (U#) which allows the use of limited C# syntax, or utilize the Udon Node Graph UI for visual scripting using 'noodles' to connect nodes together.
History
Udon Toolkit was originally announced on a blog post[1] on June 20, 2018 and introduced as the "VRChat Node Graph", and was additionally discussed during a Developer Update video[2] on June 26, 2018 to replace the 'Playmaker' toolkit on early versions of the World SDK.
Official resources
What is Udon? on creators.vrchat.com
UdonSharp Docs on creators.vrchat.com
World/Udon Bugs & Feature Requests on feedback.vrchat.com
Community resources
A list of community resources can be found in its main article: Community: Udon Guides