Neos does not currently offer C# scripting support. However, you can use Neos' plugin system to run custom plugins and/or mods. Keep in mind that plugin support is experimental and that a given plugin/mod may break at any time. In addition, Neos cannot guarantee that third-party libraries loaded into Neos will function properly and not exhibit malicious/undesired behavior. Lastly, Neos is not liable for any damages caused by use of plugins. For more information, read the wiki articles on plugin and mod usage.