Power Daemon (powerd) is a daemon that can monitor a UPS and safely shut down the machine when the power is out. It can also notify other power daemons running on the network that the power is out, so they may also safely shutdown. It can automatically determine the UPS and cable configurations.
PowerTop is tool that detects which Linux programs and kernel tunables are resulting in the largest power consumption and use of battery time. By fixing (or closing) these applications or processes, you can immediately see the power savings in the tool. You'll also see the estimated time left for battery power if you are running a laptop.
Pulsard allows you to monitor an MGE Pulsar UPS to initiate a clean shutdown in case of a power outage. It also monitors the quality of the power line. It has only been tested on Linux with the Pulsar ES8+ and the ESV8+. It uses libgpio (from the gphoto project) to communicate with the UPS, making it easy to extend it to other communication channels than RS-232.
Suspend2 allows you to hibernate your machine without needing APM, BIOS, or ACPI support. It creates an image that is saved in your active swap partitions, swap files, ordinary files or (soon) across a network. At the next system boot, the kernel detects the saved image, restores the memory from it and then it continues to run as if you'd never powered down.
TrinityOS is a step-by-step, example-driven HOWTO on building a very functional Linux box with strong security in mind. TrinityOS is well known for its strong packet firewall ruleset, Chrooted and Split DNS (v9 and v8), secured Sendmail (8.x), Linux PPTP, Serial consoles and Reverse TELNET, DHCPd, SSHd, UPSes, system performance tuning, the automated TrinityOS-Security implementation scripts, and much more.