libpri is a C implementation of the Primary Rate ISDN specification. It was based on the Bellcore specification SR-NWT-002343 for National ISDN. As of May 12, 2001, it has been tested work with NI-2, Nortel DMS-100, and Lucent 5E Custom protocols on switches from Nortel and Lucent.

SpanDSP is a library of DSP functions for telephony, in the 8000 sample
per second world of E1s, T1s, and higher order PCM channels. It
contains low level functions, such as basic filters. It also contains
higher level functions, such as cadenced supervisory tone detection,
and a complete software FAX machine.

GNU uCommon C++ is a lightweight library to facilitate using C++ design
patterns even for very deeply embedded applications, such as for systems using
uClibc along with POSIX threading support. For this reason, uCommon disables
language features that consume memory or introduce runtime overhead. uCommon
introduces some design patterns from Objective-C, such as reference counted
objects, memory pools, and smart pointers. uCommon introduces some new
concepts for handling of thread locking and synchronization.

Ethtool is a small utility for examining and tuning ethernet-based
network interfaces. See the man page for more details.

get-flash-videos downloads videos from various Flash-based video hosting sites, without having to use the Flash player. Handy for saving videos for watching offline, and means you do not have to keep upgrading flash for sites that insist on a newer version of the player.