Free equivalents to Windows software

I've just learned through Lifehacker about a great page: The Linux Equivalent Project. Actually, it's a pretty impressive index of free open-source software, which will work on Solaris, Linux, or any other UNIX OS.

What I really like about this list is that you're given names of software products Windows, and they a few of open-source equivalents. Very useful, especially for all the beginners who are just switching to Solaris.

If you miss some particular software in Solaris world, please have a look: LinuxEq.com