Crowbar is described as 'Open Source platform for server provisioning and deployment from bare metal. It provides server discovery, firmware upgrades, and operating system installation using PXE Boot' and is a Server Management Tool in the Network & Admin category. There are more than 10 alternatives to Crowbar for a variety of platforms, including Linux, Mac, Windows, BSD and Online / Web-based. The best alternative is Ansible, which is both free and Open Source. Other great apps like Crowbar are Salt (Free, Open Source), Puppet (Freemium, Open Source), Chef (Free, Open Source) and Cobbler (Free, Open Source).
Chef is an open source systems integration framework built to bring the benefits of configuration management to your entire infrastructure. You write source code to describe how you want each part of your infrastructure to be built, then apply those descriptions to your servers.
Bcfg2 helps system administrators produce a consistent, reproducible, and verifiable description of their environment, and offers visualization and reporting tools to aid in day-to-day administrative tasks.