eCos (Embedded Configurable OS) is an open source, configurable, portable, and royalty-free embedded Real Time Operating System. It is written in C++, provides all the usual OS things. You configure the OS so that the parts you don't need aren't loaded to the embedded system. eCos is released under a modified GPL that allows for its use in embedded systems without having to GPL the embedded application.
EHNT (the Extreme Happy Netflow Tool) is a simple tool for getting information from Cisco's netflow, which can be used for network accounting and capacity planning. It consists of a server which receives netflow version 5 packets from routers, plus a client which presents the data. Multiple clients can be run at the same time to view the data stream in different ways.
The Emu10k1 Driver for Linux supports Creative Labs' Emu10K1 chip, which is found in SoundBlaster Live! cards. It supports full duplex sound, two sound devices (dsp, dsp1), OSS compatibility, AC97, sndstat, MIDI, a Joystick interface and more than one EMU10k1 board in one computer. It does not yet support SMP.
erpcd-talker is a simple set of utilities which communicate with an erpcd (used by Xylogics or Bay Annex terminal servers) to verify a username and password and get an IP address. It can be easily integrated into a ppp daemon or used in a fake ftp daemon which can in turn be validated against by some Macintosh login control software.