The Orbs smart contract SDK is a framework for building decentralized applications over the Orbs blockchain. These applications are made of smart contracts written in the Go programming language.
The three chapters in the documentation cover:
Getting started - a high level overview of contract development in Orbs
Orbs Contracts - how to develop a new contract - a full reference of the Orbs Contract SDK
Gamma in Depth - working with gamma-cli, the Orbs local blockchain implementation
Orbs is an MIT-licensed open source project. The source code for the contract SDK is available on Github