rsync-mirror is used to backup local directories to another location on the local machine or to a remote machine. As the name suggests, it uses rsync for data transfer so it should be pretty efficient. It does not support any nifty backup features like incremental backups; all it does is mirror a directory to another location. To ease the task of creating backups, rsync-mirror takes care of managing the destination site of the backup. In case the target path needs to be mounted, rsync-mirror does so before backup and unmounts it afterwards.
PigeBox is a complete solution to record continuous (24/7/365) audio content. It provides a bootable GNU/Linux system with all required software components to achieve the storage, the recording, and the extraction of audio content. It has been designed to provide a "plug & record" solution for radio broadcasters.
The Marionette Collective (mcollective) is a framework to build server orchestration or parallel job execution systems. It uses modern technologies and concepts that make it ideal for large and cloud-based infrastructures. It's specifically geared towards systems administration tasks, but can be seen as a generic framework too.
Chef is a systems integration framework, built to bring the benefits of configuration management to your entire infrastructure. With Chef, you can manage your servers by writing code, not by running commands (via Cookbooks), integrate tightly with your applications, databases, LDAP directories, and more (via Libraries), and easily configure applications that require knowledge about your entire infrastructure ("What systems are running my application?" "What is the current master database server?").