MAME is a multi-purpose emulation framework
BizHawk is a multi-system emulator written in C#
Third-party TI-84 Plus CE / TI-83 Premium CE emulator
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
Virtualization software for x86_64 hardware
Emulate AWS λ and API Gateway locally
Qiling Advanced Binary Emulation Framework
Proxy for Lambda’s Runtime and Extensions APIs
Xbox 360 Emulator Research Project
Play! - PlayStation2 Emulator
A portable library and tools for archiving images of Atari 8-bit tapes
Search and manage batches of D64/etc files.
Z80 shared library including some nice test-projects
Python front end for MAME that can run in Linux, Windows, and MacOS
Binary Modular DataFlow Machine (BMDFM)
Emulator of the ancient 8 bit microprocessor SC/MP 2
A free, cross-platform emulator for GW-BASIC, PCjr & Tandy BASIC
Triton is a dynamic binary analysis library