InfoWorld's top picks for the most indispensable open source software of all time
4. Three BSDs
Linux isn't the only popular free open source operating system or even the best. FreeBSD is famous for superior reliability and performance. NetBSD is celebrated for supporting a wide range of hardware platforms, including embedded systems and mobile devices. And spiny OpenBSD is touted as perhaps the most secure Unix-like operating system, with a security audit that never stops.