Einarc is a unified storage RAID command line interface and an API that provides management for various hardware/software RAID devices, uniting them all in a single paradigm. Einarc works as a translator that makes it possible for a user to control all these devices using simple terms like "physical disc", "logical disc", "adapter", etc., while transparently converting these requests to proprietary RAID paradigms.
Spindown is a daemon to spin down idle disks and thus save energy and give the disks a longer lifetime. It also works with USB disks and hot-swappable disks because it uses the device ID to identify the disk instead of the device name (such as hda or sdb). This means that it doesn't matter if the disk is swapped while the daemon is running.
Multiple Devices Proxy is an application proxy to communicate with pipes, serial ports (RS-232/RS-485), TCP/IP, and potentially all devices in a host computer via TCP/IP sockets. It supports multicast and communication isolation. Any server may have many resources, e.g. 2 pipes, 4 RS-232, and 2 connected sockets to another server. Clients may ask for 1 to many of these resources, and all data will be multicast.
Cerberus-Prox is backend software for an inexpensive, easy-to-build hardware system that implements a functional door access control system. It supports HID clock-and-data prox card readers. A MySQL database (or theoretically any JDBC) is used for data storage. RXTX is used for serial port communication.