Oxide[]
Oxide tools provide a framework for server-side scripting. You can download their API here, and start writing server mods for Hurtworld in C#, Javascript or Python!
For Oxide support and questions, see the Oxide forums.
Hurtworld SDK[]
The Hurtworld SDK is an official tool for creating custom content in Hurtworld. It currently supports custom Levels, simple networked objects, and custom Construction Packs. The SDK comes with a number of tools and frameworks to make creating mods easy.