We had earlier featured many open source software, but here is a list that is the God of all the open source software, the software that is matured, well-established, popularized open source development and the use of free open source products. These projects are serving as a foundation to many software development projects, business networks and the public Internet for years and showed the world the power of community development.
4. FreeBSD, NetBSD and OpenBSD
FreeBSD is famous for superior reliability and performance. NetBSD is famous for supporting a wide range of hardware platforms, including embedded systems and mobile devices. OpenBSD is advertised as possibly the most secure Unix-like operating system, with a security audit that never stops.