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JSGB is a Nintendo GameBoy emulator. Written in JavaScript and HTML5. Integrates a debugger with breakpoints support, memory, viewer and more... You can test it here: www.codebase.es/jsgb/?v=0.02
For new versions, check https://github.com/Darkkey/javaNetSim
javaNetSim (Java Network Simulator) - it's a fork of a project jFirewallSim. The main goal of javaNetSim is creating a software to simulate various TCP/IP networks based on Ethernet, WiFi, PPP, etc...
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Storesim simulates creation of large amount of random files. Directory structure created is similar to what is done in very large file repositories: based on hashdirs (found in mailservers, NFS servers, files servers, image databases...)
JStella is a Java-based Atari 2600 VCS emulator. It allows one to play old Atari 2600 games in an operating system independent manner. It also supports web page based applets. Its emulation core is based on Stella-Atari 2600 Emulator.
SnareJ is a Java-based system that might run some old RISC OS programs. Support for the various modules and APIs is thin at the moment, but some [simple] programs will work.
A Java-based Commodore 64 emulator. Runs most of C64 games and many demos. Emulates CPU (6510), VIC-II (on a cycle level), SID (including filters, combined waveforms and bugs) and CIA. Easy to add to any web-page using Java/Javascript.
DiskImagery64 is a portable (Qt-based), open-source disk image editor for Commodore 64 disk images running on Mac, Linux and Windows. It offers a nice GUI with drag-and-drop support between disk images, the local file system and real retro hardware.
A C++-based Commodore 64 emulator that is written with portability to other platforms in mind. A first implementation for the .Net platform has been created, others should follow.
c64img is a PHP script that converts an image to an image that can be shown on a Commodore 64 (FLI style). It searches for the best possible colors in the 160x200 (X-doubled) resolution, and uses a simple dithering method to distribute errors.
The Cell framework is a scalable server framework written in C#. It's original purpose is for MMOG emulation but can be easily adapted to other areas. The project includes a proof of concept rewrite of the DAoC emulator DOL.
AdaptiveCells J2EE generates test-beds for benchmarking J2EE performance. They consists of highly customizable EJB cells that can emulate CPU load, memory usage, memory leaks and exceptions. The behaviour of the cells is coordinated from a web front-end.
qsh is a shell for any operating system. It is coded in java so it inherits the pros and cons of java. It is in a very nascent stage, but all the regular commands work: Directory navigation, file tasks etc.
The Network Simulation Environment (NOSE) has the capability to virtually create complex networks including different types of operation systems very cost-efficient on a single computer.
The Wolfram Machine project is an effort to create a set of documentation and useful modules (both hardware and software) for a computing architecture based on the mathematical theories presented in Steven Wolfram's book _A_New_Kind_of_Science_.