SkySOUND is a free audio library built on top of common audio libraries like MIDAS or SEAL, but with several built-in sound drivers (for OSS and Windows). It includes a powerful IntelASM- optimized MPEG Audio 1/2 layer I/II/III decoder, which is a partially rewritten version of the XingMPEG Decoder.
sh-httpd is a shell script-based Web server that supports GET and HEAD methods, and a CGI 1.1 interface. It's not real fast, and it's probably not real secure, but it is really small. The Web server and it's configuration files are around 9,000 bytes total, and that's with comments and pretty whitespace. If you can run ash or bash, an inetd, and about 7 standard external commands on your system, you can have a Web server with CGI support. There's also a timeout counter that kills never-ending CGI programs, cleans up, and exits.
SHACC (Shaggy's Homebrew Alternative Compiler Compiler) reads an extended yacc-style grammar specification and generates an LR(k) parser for it. The main purpose of SHACC is to be able to parse complex grammars with ambiguities that YACC cannot handle, such as C++ (which it was originally developed for). If your grammar results in lots of shift/reduce and reduce/reduce errors in YACC, and you don't want to rewrite it in ways that make the grammar more complex and hard to understand, you might want to try out SHACC instead.
Sharity-Light for Linux is derived from smbfs, but runs as a user level program, not in the kernel. It is roughly the opposite of Samba since it's a client for the Lanmanager protocol. Sharity-Light lets you mount drives exported by Windows (f.Workgroups/95/NT), Lan Manager, OS/2 etc. on Unix machines. The former name of this application was "rumba".