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.
Noca is a shared library that prevents the page cache from filling with data that we know we only need once. It hooks read, lseek, and close. If some conditions are met, they trigger an fadvise call so that the memory is freed. An example of its use could be to limit the page cache of a "tar zxvf" operation to a specified size, no matter how big the archive is.
The Ad hoc Protocol Evaluation testbed is a small Linux distribution intended for the analysis of ad hoc networking environments. It is self-contained and pre-configured, and contains tools for data gathering at both the IP and ethernet level. It also has a scenario scripting system, which enables APE test runs to use movement choreography, with instructions to participants.
VIA High Speed Serial is a little kernel module (1 KB) which enables high speed serial port modes of VIA VT82C686A or VT82C686B southbridge-equipped motherboards. Basically, this is developed for ISDN-TAs, which at least in europe are constrained by the normal serial port speed of 115200 bit/s. With this module, you can use the serial port at 230400 bit/s so that you can get the full 128000 bit/s from ISDN-TA. The module has been tested with both 686A and 686B chipsets. Functionality is the same as with SHSMOD patches, but you don't have to patch the serial port driver.