They also made Filemaker for Windows before spinning it off as a separate company. In the past, they made QuickTime and Safari for Windows, which were made obsolete by better alternatives (like Chrome, which uses the same WebKit engine as Safari). They are still supporting iTunes, iCloud, and Bonjour, and Windows drivers for Apple hardware (required to make Boot Camp work).
Dang I forgot that, gave my CD version to a friend for his PC, way back.