MachDB is machine database to catalog of the changing state of your hosts. It consists of a database, an aggregator, an XML spec and some example information gathering scripts. Along with a Web UI, these form the basis of a system that will allow you to catalog the current and historical state of the hosts in your infrastructure. It has been designed with scale in mind, the goal is to support 10k hosts. It is being actively developed and although in alpha testing, is used in production at a few organizations.