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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.
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.
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_.
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The Java Framework for Computer Emulation (JFraCE) is a framework
written completely in Java for emulating (old)
computer systems on the software level. Currently only an emulator of a Z80-based CP/M machine is implemented.
UTBlazer is a multiprocessor platform simulator developed in Java based on the Xilinx MicroBlaze processor and FPGA design platform. This system simulator is a back-annotated cycle-accurate functional emulator in fact.
A Java based simulator for the LC-3 16bit processor used in several CSS classes.
(specifically in the book "Introduction to Computing Systems: From Bits and Gates to C and Beyond" (2nd Ed)
Moved to GitHub