Free system emulator software for linux

VT6530 Terminal Emulator is a Java implementation of the proprietary terminal used with Tandem mainframes.
The Tandem VT6530 is a proprietary terminal used with their Non-Stop(TM) series of mainframes. These high-reliability machines are popular in the banking industry. If youve ever used an ATM to get cash, youve probably used a VT6530.
The terminal itself can operate in three different mode: conversation, block, and ANSI (VT100). Conversation mode is a simple scrolling text mode with the addition key buffering and text attributes. In block mode, text is displayed in a formated screen with special edit fields. ANSI mode is only used with OSS, Tandems UNIX wanabe operating layer.
Enhancements:
- Autotools support (./configure, make, make check, and make install).
- New telnet and ANSI terminal implementations.
- Linux, Cygwin, and HP NonStop (tandem OSS) builds are not quite running yet.

All System Info is a system info SuperKaramba theme. Simple english version...
It shows:
- System Info
- CPU usage
- Network Usage
- Memory Load
- HDD usage

Wide Area Link Emulator enables you to set and test various parameters of a WAN access link (also known as a bottleneck link) before testing on a fully-functional network.

Any ISP has a high bandwidth LAN (of the order of tens of Mbps, e.g. Ethernet) and a WAN access link with relatively low speeds (of the order of a few Kbps to a few Mbps). To be able to evaluate the ISPs performance, actual tests will have to be conducted on a live, fully functional network. This would imply enabling certain features in communication equipment which could be detrimental to the proper functioning of a commissioned network. To address such a problem of being able to characterize/quantify the network operation in terms of its performance with respect to various parameters, a test-bed emulating the ISPs connectivity to the Internet would be an ideal solution.

An important factor in setting up such a test-bed, is emulating the WAN Access Link. Using complex hardware is costly. Such a link can however be easily implemented by emulating the scenario on popular physical technology such as Ethernet. By changing the TCP/IP stack on a Personal Computer, the rate at which packets are injected into the network can be controlled and other necessary features can easily be added.

WALE was implemented in 2 phases and the first version can emulated bandwidths up to 8Mbps and uses FIFO queues with drop-tail.

WALE v2 can emulate bandwidths of up to 80Mbps(a 10-fold improvement over version 1) due to the stripped down version of Micro-second resolution timer being used in the Linux kernel. WALE also implements differentiated services are recommended by IETF. A hash-based packet classifier is used to classify packets into one of 3 queues (Expedited Forwarding, Assured Forwarding and Best Effort). A simple priority scheduling has been implemented between the queues.

Version 2 has been implemented in the Generic Device Layer of the Linux Kernel. The kernel version is 2.2.19. WALE2 kernel patch can be downloaded here. An ncurses based front end has been implemented for setting and viewing various parameters of the bottleneck link.

Unix Amiga Delitracker Emulator (UADE) plays most Amiga music file formats by simulating Amiga hardware and software.
Unix Amiga Delitracker Emulator plays over 180 Amiga music file formats and has three frontends for playing: a command line tool, an XMMS plugin, and a Beep Media Player frontend.
Enhancements:
- An improved version of the Special FX replayer was added.
- A new Special FX ST replayer was added.
- Bugs in song length database handling were fixed.
- Audacious 1.3 is supported.
- 15 instrument soundtracker module detection is supported.

system-tools-backends is a package for GNOME.

to extract the configuracion

backend --get

to restore the configuration from XML

backend --set < file.xml

Spectemu project is a 48k ZX Spectrum emulator.
Spectemu is a fast and nearly perfect emulation of the 48k ZX Spectrum computer. It can be run in an X11 window or on a Linux console. Features include sound output, tape emulation (with border stripes and sound), snapshot saving and loading, and an interactive keyboard picture.
It emulates the Z80 processor as well as the 48k Spectrums other hardware: keyboard, screen, sound, tape I/O. The emulation is very close to the real thing, but it is still quite fast (It was reported to be working well on a laptop with 486 at 25Mhz!).
On the other hand, the user interface is not the best. If you would like to see such features as Spectrum 128 or IF1 emulation, and dont mind the speed decrease, then have a look at xzx, another Spectrum emulator for UNIX. (Maybe sometime Spectemu will also support those.)
Main features:
- Quite fast
- X Support with MITSHM on a local display
- Console graphics support with Linux Svgalib
- Sound support (with Linux Open Sound System and SUN sound driver)
- Snapshot saving and loading (.z80 and .sna format)
- Tape emulation with .tap and .tzx files (I/O emulation with border striping and tape sound)
- Optional quick loading of tapefiles
- "Animated" keyboard picture NEW
- Configuration NEW