Popular Linux distributions:-
..: Red Hat
Enterprise level Linux Server from Red Hat.
Enterprise level Linux Server from Novell.
No-cost rebuild of Red Hat Enterprise.
Red Hats no-cost community offering.
Pure Linux built from kernel.org and GNU.
A reworked Debian, emphasising end user friendliness.
A reworked Ubuntu, even smoother. New users start here.
The longest established distro - now over 20 years since the first release.
More information about the various Linux flavours..
Linux support and documentation:-
..: Linux system tuning
Improving server performance.
..: The Linux Documentation Project
The central repository of Linux FAQs and HOWTOs.
..: Linux User Groups (LUGS)
Find your LUG here for local support.
..: Linux from Scratch
How to build your own custom Linux system.
A few Linux applications:-
A network-enabled configuration toolset for Unix and Linux systems.
..: The Apache Software Foundation
The world's most popular web server - and much more.
..: Sendmail SMTP server
An extremely configurable email server software.
The Linux firewalling subsystem.
..: The FreeS/WAN project
Build Virtual Private Networks with Linux for no cost.
..: Open Office
A free alternative to Microsoft Office (also runs on Windows).
..: SAMBA - opening windows to a wider world
Network filesharing between Linux and Windows.
..: The Gimp
Photoshop-like graphics package - used for graphic production on Skywhale.NET.
..: The Mplayer project
A movie player for Linux (beats Windows Media Player in my experience).
..: Linux Quake
The famous first-person shooting game - developed under Linux, apparently.
More Linux links to follow later.......