pppctl is a suite of programs suitable for use by those with ppp connections. It includes programs to facilitate charging for use of the connection, controlling the connection from a web page and selecting from a range of ISPs to use to dialup. It's also ideal for doing automated mail/news polls.
picoTK is a C GUI toolkit that requires only a minimum of memory resources. It is intended for embedded system use, especially for (but not limited to) the RTEMS realtime kernel. It is in no way comparable featurewise to a "real" full blown windows toolkit like Qt or nanoX; it rather provides simple drawing primitives like lines, filled rectangles, characters, and pixmaps. (But that is what many embedded applications might ask for.) It directly works on tailored "framebuffer" hardware. A Linux framebuffer emulator is supplied as part of the kit, making evaluation (and emulation!) possible without having a realtime OS and custom hardware.
PGP Pipe allows encrypting a data stream of arbitrary length with the IDEA chipher from PGP. It is fast and usefull for secure backups on tapes or across the network. To prevent that this program is considered "strong cryptography", the encryption routines are NOT included, so you have to get the PGP source to compile it.
Phluid is a window manager that emphasizes efficiency, speed, and beauty. It uses rasterman's Imlib2 library as the image/font rendering backend. It also attempts to be flexible and compliant with the ICCCM standard and gets a lot of its inspiration from the enlightenment window manager, but some of the initial code design is based on aewm.