Info-ZIP portable compression/archiver utilities (Zip, UnZip, WiZ, etc.)
Development toolkit for Web Services and XML data bindings for C & C++
The gSOAP toolkit is an extensive suite of portable C and C++ software to develop XML Web services with powerful type-safe XML data bindings. Easy-to-use code-generator tools allow you to directly integrate XML data in C and C++ (and C++11/C++14). Serializes native application data in XML. Includes WSDL/XSD schema binding and auto-coding tools, stub/skeleton compiler, Web server integration with Apache module and IIS extension, high-performance XML processing with schema validation, fast MIME/MTOM streaming, SOAP and REST (WCF compatible), WS-* protocols (WS-Security, WS-Policy, WS-ReliableMessaging, etc), XML-RPC and JSON. Licensed under GPLv2. Commercial licensing and technical support options are available: visit the project web site.
NetHack is a popular single player dungeon exploration game that runs on a wide variety of computer systems.
SIMH is a highly portable, multi-system simulator.
An operating system kernel designed with simplicity, readability, and elegance in mind. No longer written from scratch, but built on "the shoulder of giants." Specifics are given in the CREDITS file starting from v0.04
ProcessViewBrowser & ProcessViewServer represent an OpenSource attempt to industrial process visualization. It is based on Qt and is very portable. (Now also available as commercial software)
Pack files into C source code similar to sharutils. To extract files, compile and run the C source.
Trek7 the original multiplayer network star trek game from the early-mid 70s. We are hoping to revive this classic (no, its not netrek/mtrek, not even close). hopefully the SF community can help port this to modern day networks.