A SIMULA-based structure oriented language for the dynamic simulation of chemical plants — The Computer Journal

http://comjnl.oxfordjournals.org/cgi/content/abstract/17/1/28

A SIMULA-based structure oriented language for the dynamic simulation of chemical plants

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GNU Cim – GNU Project – Free Software Foundation (FSF)

http://www.gnu.org/software/cim/

GNU Cim is a compiler for the programming language Simula (except unspecified parameters to formal or virtual procedures (see the documentation for how portable code for formal procedures can be written)). It offers a class concept, separate compilation with full type checking, interface to external C routines, an application package for process simulation and a coroutine concept.

The GNU Netcat — Official homepage

http://netcat.sourceforge.net/

Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol.
It is designed to be a reliable “back-end” tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.