From: eLinux.org

Emulators

• Qemu - hardware emulator - for everything (try this
  first)
• Skyeye - for ARM
• Aranym - for M68K
• Hercules - For S390
• UNetICE for ARM7 and
  ARM9 processors from Embest
• XDS100v2 for TI
  processor available from Embest