Fast PlayStation 1 emulator for x86-64/AArch32/AArch64
A fast usermode x86 and x86-64 emulator for Arm64
Original Xbox Emulator for Windows, macOS, and Linux
Researching Wii U emulation
A work-in-progress PlayStation 4 emulator
Xbox 360 Emulator Research Project
Game Boy and Game Boy Color emulator written in C
DOSBox Staging is a modern continuation of DOSBox
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
Try Customization Android-x86 OS is Faster, lighter than Emulator with
A multi-purpose emulation framework
AndroidAuto headunit emulator
Qt-based Nintendo Entertaiment System emulator and NSF/NSF2/NSFe Music
An experimental Symbian OS emulator
DS emulator, sorta
xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju
Appliances of free/open source operating systems for VirtualBox
BizHawk is a multi-system emulator written in C#
Third-party TI-84 Plus CE / TI-83 Premium CE emulator
a GUI for virtual machines using QEMU as the backend