KEGS is an actively-developed Apple IIgs emulator, originally written for HP workstations, improved and customized for Linux. It runs under X at any display depth, and supports changable memory sizes, joysticks, and sound. KEGS boots all Apple II OS variants, and supports all of the graphics modes of the Apple IIgs. It requires a copy of the Apple II system ROMs. Kegs has been adapted to work under Mac OS X, Windows, and the SDL library.
The Free Unix Spectrum Emulator (Fuse) is an emulator of the 1980s home computer and various clones. It emulates the Spectrum 16K, 48K, 128K, +2, +2A, +3, +3e, and SE, the Timex TC2048 and TC2068, the Pentagon, and the Scorpion. Almost all the common Spectrum emulator file formats are supported, including .rzx input recordings, .tzx tape images, and .szx and .z80 snapshots.
ep128emu is a portable emulator of the Enterprise 64/128, ZX Spectrum 48/128, and Amstrad CPC 464/664/6128 computers supporting Windows and POSIX platforms (32-bit Windows and 32- and 64-bit Linux have been tested). It implements accurate, high quality hardware emulation, but the system requirements are higher than that of most other emulators.
Snes9X is a portable, freeware Super Nintendo Entertainment System (SNES) emulator. It basically allows you to play most games designed for the SNES and Super Famicom Nintendo game systems on your PC or Workstation; they include some real gems that were only ever released in Japan. Snes9X is coded in C++, with three assembler CPU emulation cores on the i386 Linux, MS-DOS and Windows ports.