Powertweak-Linux is a tool to tune your system to its optimal performance settings. It started life as the replacement for the now obsolete kernel option 'tune PCI bridges', and has been extended to provide more features and support more chipsets. It can also tune network/filesystem performance using /proc/sys entries, disk elevator settings, and x86 CPU registers (needs 2.2.18 or 2.4.0test kernel), CDROM speeds, hdparm type features, and Sony VAIO backlight. It has both a GTK GUI and a text-based lister.
hprofile is a simple way to manage profiles for hardware configurations, network connections, power management, usage patterns, and many other things. A profile can define alternate versions of any configuration (or other) file, anywhere in the file system, and arbitrary scripts can be run when profiles are started or stopped (e.g. to configure hardware or start/stop services). Special support is also included for 'boot' profiles, allowing you to select profiles at startup and enter different runlevels depending on which profile was selected. It's easy to use and configure, and comes with comprehensive documentation.
inAccess Networks JTAG tools is a collection of code and a set of tools for using the JTAG interface (present in most modern microprocessors) to perform hardware tests, and for programming Flash Memory Devices connected to the processor's bus. It is especially useful for performing initial hardware tests and for bootstrapping prototype systems. It runs on a "host system" (e.g., a desktop computer with Linux) and accesses the "target system" (e.g., the embedded system's CPU board) through a simple five-line hardware interface. The host system's parallel port is used as the hardware interface, though other arrangements can be supported very easily. It is quite modular and though it currently supports the Intel StrongARM SA-1110, the Intel PXA255, and the Intel StrataFlash ICs, it can be easily extended to support other target hardware configurations by writing simple modules.
Hotplug lets you plug in new devices and use them immediately. That means that users won't need to learn so much system administration, since the Linux system will at least partially autoconfigure itself. Initially, hotplug included support for USB and PCI (Cardbus) devices, and could automatically configure some common network interfaces. Updated versions include IEEE 1394 (Firewire/i.Link) support and can download firmware to USB devices that need it.
Finnix is a small, self-contained, bootable Linux CD distribution ("LiveCD") for system administrators, based on Debian testing. You can use it to mount and manipulate hard drives and partitions, monitor networks, rebuild boot records, install other operating systems, and much more.