acWEB is an OpenSource replacement for MS IIS and other proprietary WEB servers for Windows. Unlike IIS, acWEB is not affected by viruses like CodeRed, Nimda, etc :).
The OS561 operating system based around FORTH/Java. The OS is to run on a VHDL chip OpenHardware design called the Minon, but could become available for other platforms. The unique point of the design is a revolutionary data compression technology.
Muq is a network server that goes several design generations beyond MOO or Java in providing support for applications characterized by these five requirements: Multi-user, Persistent state, Complex data, Complex code, and Distributed networking.