GeoWorks, Microsoft Windows' Upstart '90s Competitor (2016)

GeoWorks was a GUI-based operating system developed by Berkeley Softworks, initially as GEOS for the Commodore 64, and later for PCs. It was designed to be lightweight and functional on inexpensive hardware, and was popular in the early 1990s. The operating system was created by Berkeley Softworks, not to be confused with Berkeley Systems, which developed the 'flying toasters' screensaver. GeoWorks was eventually renamed from GEOS in the early 1990s and was bundled with some PCs, including a 386 computer that the author used as a kid.