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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.
MuCTools is a group of command line utilities connect with Philips'P89C668 (8051 type) and other Philips microcontroller bootloaders, completing the 8051 development chain with free software for linux. muctools0.9 works with limited features. See README
ttypatch is a Linux application that permits two or more "serial port user programs" to reliably connect to each other without the use of actual serial ports. Also acts as a virtual patch panel among any number of real and virtual serial ports.