KMON
Linux Kernel Manager and Activity Monitor
... systems. Linus Torvalds conceived and created the Linux kernel in 1991 and it's still being developed by thousands of developers today. It's a prominent example of free and open-source software and it's used in other free software projects, notably the GNU operating system. Although the Linux-based operating systems dominate most of computing, it still carries some design flaws which were quite a bit of debate in the early days of Linux.