NP3 Music Player is a standalone music player, which has a distinct separation between client and server. It consists of a daemon, which plays the files (through XMMS input plugins), and is controlled by a client. It features an event system, which enables excellent support for sophisticated clients.
jumpstart is a performance hack for Linux/x86 that runs an application with shared libraries already loaded. The executable file is started, then stopped after the runtime loader has mapped the shared libraries, but before any application code has run. Then the process acts as a server, reading command line arguments and environment via a named pipe, and executing the task in a fork()ed child.
h2incn tries to directly convert C/C++ headers to Nasm-style include files, and can be used in a makefile. It is useful if you want to use the same structures or external variable declarations in C and assembler code, and you don't want to use two separate files and update both each time you change something. It is written in a mix of C and C++ code. It currently works for simple files.
Over5 is a program for transferring between c64/vic20 machines and Amiga/PC/UNIX boxes. It supports serial transfer at 38400 bps using only a RS-232 level converter and a 3-line standard nullmodem cable. No special serialport chips are needed. Source code is included. It features read/write/execute memory, filecopy with wildcards, read/write raw disk, read/write ZIPCODE archive, the ability to use the Amiga/PC/UNIX box as a harddisk server ($0801-$f600), builtin diskturbo, and a fast basic bootstrap for most cbm 8-bitters.
FECpp is a C++ library implementing a fast forward error correction code, sometimes also called an erasure code. These codes are used to split input data into a set of n shares, with the property that if any subset of at least k shares survives, the original data can be recovered by the decoder. The number of share losses the code will tolerate can be parameterized during encoding, allowing the code to be adapted to to a variety of loss scenarios. FECpp is bit-for-bit compatible with several other FEC libraries.
sr-convert is a sample-rate conversion utility for WAV files. It supports a wide variety of sampling rates and can convert from any of the supported rates to any other. It runs under either x86 Linux or Windows and uses SSE instructions if they are available. Great pains have been taken to make sure that the sound quality of the conversion is excellent.