What are some of the major pro/con of FreeBSD vs GNU Linux vs OpenSolaris?
Here is a very good (albeit a bit outdated) article about FreeBSD vs Linux vs Windows (sorry, no OpenSolaris). It’s worth reading. I’ve been a fan of FreeBSD for over 15 years, after learning about it from admins that were running an ISP I worked at. FreeBSD is legendary for its stability, has lots of documentation, huge ports collection, and it even allows running Linux binaries. I built three servers for my latest project using FreeBSD and couldn’t be happier.