This document describes sustainability-orienting system design tools, including the Sustainability Design-Orienting (SDO) toolkit. The SDO toolkit is a modular software that supports orienting the system design process towards sustainable solutions. It includes processes for analyzing an existing system, identifying sustainable best practices, generating sustainable ideas, and checking the sustainability of developed concepts. The document provides details on the structure and components of the SDO toolkit and how it can be integrated into the design process to increase sustainability.