openDCIM is a free, web-based application aimed at optimizing Data Center Infrastructure Management (DCIM) to enhance the efficiency of data center operations. Distributed under the GPL v3 license, it permits users to alter and share the software, provided they give appropriate credit. The main objective of openDCIM is to reduce dependence on spreadsheets or word-processing software for managing data center inventories. Its essential features include robust physical inventory management, the ability to support multiple rooms, and management of capacity centered on space, power, and cooling requirements. Additionally, it provides basic contact management by allowing integration with existing business directories via UserID, tracks fault tolerance to model power outages, and calculates the center of gravity for each cabinet. Features also include management templates for devices, optional tracking of cable connections within cabinets and for each switch device, as well as archival capabilities for disposing of equipment, ensuring a comprehensive approach to data center management. This well-rounded tool aims to modernize and simplify the complexities associated with data center operations.