BizHawk is a multi-system emulator written in C#
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
An advanced network simulator to design and configure virtual networks
V.Smile emulator written in C, C# and XAML
A simple and fast frontend for the QEMU Emulator - Freeware.
A simulator for the Multics dps-8/m mainframe
a very fast full system simulator
To be a practical Arduino simulator
MILE - MIPS Interactive Learning Environment