Beforehand: On this page you will find links and references related to UNIX™, UNIX based-systems and the Unix Community.
Note: It is not always easy to use the correct name and I actually did not want to touch this but hey, it's part of the community... Personally i do not care mucht on how "you" classify software and operating system but you should [at least] know the difference.
Note: If anyone can write this more clearly, step forward and give it a shot by commenting.
Organisations: The Free Software Foundation, Open Source Initiative (OSI), The Open Group, USENIX Association, Source Technology Group (OSTG), Linux Professional Institute, The UNIX System Home Page (Open Group), Open Invention Network
Project oriented: The GNU Project, OSDL, Debian -- Universal Operating System, The Linux Kernel,
Free OS: Distrowatch, FreeOS.com, Microsoft alternatives, Linux, *BSD variants, HURD (on Mach or L4), and various others, ...
See also: OSS/FS reference from D.Wheeler
See also: The Open Group Certification Programs, Free Standards Group
References: PuTTY Feedback and Bug Reporting, How to Report Bugs Effectively, How To Ask Questions The Smart Way, SF Project Help Wanted