Hercules System/370, ESA/390, and z/Architecture Emulator: An open source System/370, ESA/390 and 64-bit z/Architecture emulator for Linux, Windows, Solaris, FreeBSD, and Mac OS X

HP Calculator Emulators: The Emulators page of HPCalc.org, source of software for, and information about, the HP48 and HP28 RPN programmable graphic calculators and the HP38G programmable graphic calculator

Wine Development HQ: Wine is a free implementation of Windows on Unix. WineHQ is a collection of resources for Wine developers and users