== Linux kernel development ==

 * LinuxMM:LinuxMM Linux memory management wiki
 * [http://linux-mm.org/HugePages Huge pages wiki]
 * [http://linuxfs.pbwiki.com/ Filesystems wiki]
 * [http://www.linuxfoundation.org/collaborate/workgroups Linux Foundation Workgroups]
 * [http://kernel.org kernel.org - Home of the Linux kernel]
 * [http://kernel.org/doc kernel.org/doc Kernel Documentation]
 * [http://bugzilla.kernel.org Bugzilla - Linux kernel bug management tool]
 * [http://crashcourse.ca/introduction-linux-kernel-programming-2nd-edition/introduction-linux-kernel-programming-2nd-edition Linux Kernel Programming Course]

== Linux distributions open for participation ==

 * [http://centos.org/ CentOS]
 * [http://www.damnsmalllinux.org/ Damn Small Linux]
 * [http://www.debian.org/ Debian]
 * [http://fedoraproject.org/ Fedora Project]
 * [http://www.gNewSense.org/ gNewSense] 
 * [http://www.linuxfromscratch.org/ Linux From Scratch] 
 * [http://www.opensuse.org/en/ OpenSUSE]
 * [http://www.pendrivelinux.com/ Pen Drive Linux - Boot and run Linux from a USB flash drive]
 * [https://www.scientificlinux.org/ Scientific Linux]
 * [http://www.ubuntu.com/ Ubuntu]

== General Linux ==

 * [http://tldp.org/ The Linux Documentation Project]
 * [http://tldp.org/LDP/abs/html/index.html Advanced Bash Scripting Guide]
 * [http://www.regular-expressions.info/reference.html Regular Expressions Reference - Basic Syntax]
 * [http://www.grymoire.com/Unix/Sed.html Sed - An Introduction and Tutorial]
 * [http://www.linuxlinks.com/ Linux Links]
 * [http://freecode.com/ FreeCode]
 * [http://www.linuxcookbook.com/ Linux Cookbook - tips and hints]
 * [http://www.freesoftwaremagazine.com/ Free Software Magazine]
 * [http://www.oualline.com/vim-cook.html Vim Cookbook]
 * [http://thomer.com/vi/vi.html Vi Lovers Home Page]
 * [http://vimdoc.sourceforge.net/htmldoc/version7.html Vim Documentation]

== Security related ==

 * [http://www.linuxsecurity.com/ Linux Security] detailed Linux security news site

== News sites ==

 * [http://lkml.org Linux-kernel mailing list (LKML)]
 * [http://marc.info/?l=linux-kernel MARC view of LKML]
 * [http://www.lwn.net Linux Weekly News] - follow the kernel link (changes weekly) (the current kernel page is always http://lwn.net/current/kernel.php3).
 * [http://www.kerneltrap.org/ Kerneltrap] - news on various free OS kernels (Old, have contacted Jeremy)
 * [http://web.archive.org/web/20071012002855/http://kerneltraffic.org/ Kernel Traffic (link to Internet Archive)] - a digest of what was discussed on the Linux-kernel mailing list (original site has disappeared)
 * [http://www.Linux-magazine.com/ Linux Magazine]
 * [http://www.linux.com/ Linux.com]


== Other operating systems actively being developed ==

 * [http://netbsd.org/about/ NetBSD]
 * [http://openbsd.org/ OpenBSD]
 * [http://www.dragonflybsd.org/ A Peek at the DragonFly Virtual Kernel]
 * [http://www.freebsd.org/ FreeBSD]
 * [http://www.minix3.org/ The MINIX 3 Operating System]
 * [http://hub.opensolaris.org/bin/view/Main/ OpenSolaris]