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The Null-modem emulator (com0com) is a kernel-mode virtual serial port driver for Windows. You can create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. The HUB for communications (hub4com) allows to receive data and signals from one COM or TCP port, modify and send it to a number of other COM or TCP ports and vice versa.
Mrxvt is a multi-tabbed X terminal emulator based on rxvt. It is portable, lightweight and fast. It supports psuedo-transparency, background image (JPEG/PNG/XPM), tinting, NeXT/Rxvt/Xterm/SGI style scrollbar, multi-languages (CJK), XIM, freetype font...
Micro-80 aims to simulate a Z80 homebrew computer down to the bare metal: 64K RAM, ADM-3A terminal, parallel port, serial port and...3.5" 1.44MB floppy drive?!