8bitworkshop IDE uses FreeDOS
Ben C shared this interesting website that uses FreeDOS: "8BitWorkshop provides a web-based IDE that targets multiple systems. The x86 target runs FreeDOS in the browser and allows you to explore the memory map and watch memory contents in real time. It can export to github or .zip files." Retrocomputing enthusiasts will also want to check out the other hardware targets, including the Apple II+, Commodore 64, and Atari 2600.