EmuNations

VirtualBox is a powerful x86 and AMD/Intel64 virtualization solution for home and enterprise usage. It's quite feature rich, high performance yet is freely available as an Open Source Software. While it's mainly a community effort, Oracle is backing it to ensure it maintains high standards of quality...

WinArcadia is a multi-system emulator of Signetics-based machines released during the 1970's and 1980's. It supports load/save snapshots, CPU tracing, trainer, graphics scaling, automatic loading of per-game configurations, netplay and much more...

Nostlan (formally Bottlenose) is a high quality front-end launcher for gaming emulators which supports Windows, Linux and MacOs. It's currently capable of launching more mainstream emulators with nice features and its future looks quite bright!