10
The Top Open Source Resources
Apache HTTP
Not only is the Apache HTTP server the most widely-deployed Web server on the Internet, but the project gave birth to the Apache Foundation, the umbrella organization that supports many other important open source projects (not necessarily limited to Web technologies).
http://www.apache.org
Linux
Do we really have to tell you that Linux is a significant enterprise technology? Even the purest Windows shops probably have Linux running embedded on some of its network appliances. We won’t get into which distribution is best, but some of the significant ones are Red Hat, SUSE (Novell), Debian, and Ubuntu (attracting attention for the strength of its desktop Linux implementation).
http://www.redhat.com
http://www.novell.com/linux/
http://www.debian.com
http://www.ubuntu.com
Before there was Linux, there was the Free Software Foundation’s Gnu (Gnu’s Not Unix) Project, which replicated most of the core Unix utilities with the exception of the kernel. In 1991, as a computer science graduate student at the University of Helsinki, Linus Torvalds wrote an operating system kernel to be married with the Gnu software, and Linux was born. The Free Software Foundation also gave us the Gnu Public License, which mandates that any derivatives of GPL source code must also be free and open software.
http://www.gnu.org
BSD
Derivatives of the Unix-like operating system BSD (Berkeley Software Distribution), including FreeBSD and OpenBSD, compete and overlap with Linux in providing an open source operating system.
http://www.freebsd.org
http://www.openbsd.org
One of the most important enterprise development platforms and the foundation for many other open source projects, Java is championed by Sun Microsystems, which has gradually revised its licensing terms to open source standards.
http://java.sun.com
