Run KolibriOS, Linux or Windows 98 in your browser

PCjs offers a variety of online machine emulators written in JavaScript. Run DOS, Windows, OS/2 and other vintage PC applications in a web browser on your desktop computer, iPhone, or iPad. An assortment of microcomputers, minicomputers, terminals, programmable calculators, and arcade machines are also available, along with an archive of historical software and documentation.

CloudpilotEmu (or just Cloudpilot) is a web-based emulator for PalmOS. It emulates dragonball based devices and supports PalmOS up to version 4.x. CloudpilotEmu is based on the original POSE emulator.