EmuOS emulates Windows 95-98-Me directly in the browser and is already packed with retro games and old apps like Quake, the original Doom, Half-Life, Transport Tycoon Deluxe, Worms 2, Microsoft Solitaire,Winamp, classic Paint and more…

Link to Official Site

Link to Emupedia (Developers of EmuOS, source code, mirrors)

A word from Emupedia the developers:

“The purpose of Emupedia is to serve as a nonprofit meta-resource hub and community for those interested mainly in video game preservation and computer history which aims to digitally collect, archive and preserve games and software to make them available online accessible by a user-friendly UI that simulates several retro operating systems for educational purposes.”