This is one of the most popular Doom source ports. It is available for DOS, Windows, Linux and Mac OS X, and should build on any POSIX platform which supports SDL. It enhances Doom with things like TCP/IP networking, OpenGL renderer, Heretic support and much more.
MacMPEG2Decoder (aka MM2D) decodes MPEG2 video into a variety of formats, normally quicktime based, on a Macintosh (Classic & OSX).
BlitPixie is a collection of optimized software blitters, written in assembly language or normal ANSI C. They perform a lot of normal pixel moving operations, and all work in 8/16/32-bit depth.
The Gryphel Emulator emulates a Macintosh Plus and other of the earliest Macintosh computers. It can run old Macintosh 680x0 software that otherwise couldn't be used on recent machines.
Lamp is a Unix-like environment that runs in a single process (via threads) on traditional Mac OS, including standard I/O, vfork/exec, a shell, perl, sockets, virtual fs with /dev and /proc, signals, and ptrace(). Runs on 68K/PPC, and on OS X as Carbon.
vMac is a free Open Source Macintosh emulator that is available for Linux/X-Windows, Win32, DOS, MacOS, and more.
The purpose of wxSSL is to allow wxWindows programmers to write SSL programs using socket classes similar to what exists in the current wxWindows. wxSSL will implement the IPC and socket classes over SSL.