Free network simulator software for linux

Network Simulator (Ns) is a discrete event simulator targeted at networking research. Ns provides substantial support for simulation of TCP, routing, and multicast protocols over wired and wireless (local and satellite) networks.
Ns began as a variant of the REAL network simulator in 1989 and has evolved substantially over the past few years. In 1995 ns development was supported by DARPA through the VINT project at LBL, Xerox PARC, UCB, and USC/ISI.
Currently ns development is support through DARPA with SAMAN and through NSF with CONSER, both in collaboration with other researchers including ACIRI. Ns has always included substantal contributions from other researchers, including wireless code from the UCB Daedelus and CMU Monarch projects and Sun Microsystems.
Enhancements:
- Major updates were made to the PackMime-HTTP HTTP/1.1 and WPAN modules.
- Solaris/Sun C compilation bugs were fixed.

My Network Catalog is an indexing engine that allows Windows shares (or Samba shares) to be bound together over a local network.

My Network Catalog allows an easy centralized search of all the files available over the network.

GTP server simulator is a simple responder for the GTP (GTP prime) protocol that works with the Cisco Content Services Gateway to provide per-user traffic limits.

GTP` (GTP prime) server simulator (it permits any content and provide quadrants for every operation) binaries for Linux (run under Fedora Core 4 and 5).

The binary was tested with Cisco CSG.

GNUSim8085 is a graphical simulator for the Intel 8085 microprocessor.
GNUSim8085 is a simulator and assembler for the Intel 8085 Microprocessor, in GNOME environment.
GNU 8085 Simulator contains an inline assembler and a debugger.
Enhancements:
- New: Use gtksourceview as editor component.
- Fix: Syntax highlighting working again.
- Fix: About dialog does not close by pressing close button.

Unlimited Simulator project is a general purpose simulator.
Unlimited Simulator is not a game. Its a basis to create whatever simulations you want, from games to scientific simulations.
You only have to worry about physics, controls and how the world looks like. It can be at the same time a car simulator, a spaceships war game, or a scientific simulation.
While you can do these things on their own, Unlimited Simulator provides the ability to do all three at once. It allows interaction of completely different kinds of clients, thus achieving unprecedent realism and complexity.
Main features:
- multiplayer: many players by internet or two in your computer;
- create your own vehicles, tracks, terrains, sounds, objects;
- vehicles may have their own physical simulation functions, and interact with the game, creating new objects, destroying others. They can fly or float or move underwater; they can be animals, or surrealistic creations. You create.
- track can contain structures as loops, bridges, banked curves, and anything you can do with polygons;
- creating a track can be done DRAWING on the terrain (not implemented yet);
- objects can be animated and intelligent!
- everything is modular: this means almost all the stuff is plugable! No need to recompile the code;
- last, but not least: GPLed!
Enhancements:
- big debugging in ulengine/primitives.c. Several allocation problems solved.
- review of network code: structs separated in a new header, shared/net.h, and other improvements in code itself.
- review of client plugin format (what functions, names, etc).
- wrappers for the not-so-standard standard C variable types in config.h.
- cosmetic changes in some places, specially ulengine.h.
- BIG debugging in ulengine/project.c and ulengine/graphic.c. Only a billion or so bugs left.
- improved ulengine/demo.c; tests now include graphic functions.
- fixed two small bugs in drawHLine due to rounding.
- added a new projection system. Not tested yet.
- graphics test phase started: drawPixel, drawHLine, drawLine, drawFlatTri and drawShadedTri are working.
- modified POLY_UL structure: SCREENP_UL *projected field was deleted. This field is really unecessary, and deleting it saves 2*sizeof(int) bytes for each vertex. Projections are not individually saved anymore (why should they be after all?). See ulengine/project.c:projectP() to see how projected points are handled.
- added ulengine/image.c, to handle image operations.
- added ulengine/effects.c.
- textures support implemented.
- several small optimizations in ulengine/graphic.c.
- work in the server communications system.

Yet Another Machine Simulator is a machine simulator which emulates the MIPS32 architecture CPU close enough. Should be fully compliant, but we cant claim that it is. It allows cross compilation with standard MIPS32 compiler back-ends.
YAMS also provides a very simple device interface to the simulated memory, disks, network interfaces, terminals and a real-time clock. There is also support for pluggable I/O devices. Pluggable devices are separate programs that implement the functionality of one or more devices and communicate with YAMS over a network or Unix domain socket.
Many features of YAMS are configurable. For example the number of CPUs can be configured. When the number of CPUs is more than one, YAMS simulates an SMP machine. The devices are also configurable. For example various delays for disks, terminals and network interfaces can be set.
YAMS also provides a hardware console which can be used to debug programs. The hardware console can be used to set breakpoints and dump the contents of registers, TLBs and memory. The memory dumping functionality also contains a disassembler.
Performanc:
The purpose of YAMS is to provide a very simple yet realistic simulated hardware platform for educational purposes. High performace (i.e. high clock speed) was not a factor in its implementation, so a normal slowdown factor between host clock speed and simulator clock speed is in the order of 500, resulting in simulator clock speeds of only a few megaherz.
So if you are looking for a fast MIPS emulator/simulator, then YAMS is not for you.
Enhancements:
- Better portability with pthreads and printf formatting macros.
- Minor bugfixes.

Snow Path Formation Simulator is a program that models the process of people forming very distinct, and yet not always altogether logical looking, paths in the snow as they walk across open spaces.

The evolving condition of the snow is displayed graphically. This project may eventually mature into a screensaver.