Original Post
I thought it might be nice to put together a different list of peoples open-source development environments, and give some insight to people interested in getting started on this route.
As for OSs, the most popular seems to be Linux. Made up of many distributions, a few include Mandrake (easy install for new users), Red Hat (one of the most popular distros), and Debian (typically agreed to be a bit more hardcore than the others). I am a follower of the BSD camp. FreeBSD enjoys the widest user base, NetBSD has been ported to many architectures, and OpenBSD has the most rigorous code auditing and is considered the most secure by default. I have heard people say things to the effect of OpenBSD for all edge/networking devices (Firewalls, Routers, Bridges, etc), FreeBSD for your servers (WWW, Mail, DNS, etc), and NetBSD for your desktops. I am a fan of OpenBSD for everything; as with everything mentioned in this thread, users need to evaluate each tool and decide on its usefullness in relation to their objectives.
X-Windows is the defacto windowing system for the *nix OSs. It can be coupled with desktop environments (such as KDE and GNOME), as well as desktop managers (such as Enlightenment).
Oh goodness...I have to go to work for a few hours. I will return to this thread and update the links later tonight. I''ll begin to start pointing to some tools as well!
The Tyr project is here.