Advanced user account controls, file permissions, job accounting.
SerenityOS Community-led project (founded by Andreas Kling)
Haiku is a unique project that preserves the innovative spirit of BeOS—focusing on a fast, elegant, and unified personal computing experience
Windows OS, developed by Microsoft in 1985, is the world’s most widely used desktop operating system.
FreeRTOS Real-time microkernel (non-monolithic
Before OS/360, IBM developed separate hardware and software for each computer model. Programs written for one system wouldn’t run on another.