國外
http://lwn.net/
http://www.tldp.org/
https://rhn.redhat.com/
http://www.justlinux.com/
http://www.linuxtoday.com/
http://www.linuxquestions.org/
http://www.fokus.gmd.de/linux/
http://www.linux-tutorial.info/
[url=http://public.www.planetmirror.com/]http://public.www.planetmirror.com/[/url]
http://www.freebsdforums.org/forums/
http://www.netfilter.org/documentation/
http://www-106.ibm.com/developerworks/linux/
http://www.redhat.com/docs/ redhat官方文檔，redhat用戶必看
http://www.redhat.com/apps/support/errata/ redhat安全性警告、軟件更新和增強，建議每週至少查閱一次
國內
http://www.fanqiang.com/
http://www.linuxsir.com/
http://www.chinaunix.net/
http://linux-fans.com/
http://www.linuxfans.org/
http://www.linuxeden.com/
http://www.linuxforum.net/
http://www.linuxaid.com.cn/
http://freesoft.online.sh.cn/
http://www-900.ibm.com/developerWor…nux/index.shtml
redhat linux下載地址
ftp://ftp.redhat.com/pub/redhat/linux
http://redhat.com/download/mirror.html
redhat 發行版全球官方鏡像站
http://freesoft.online.sh.cn/ 國內高速下載
http://www.linuxeden.com/
http://www.freshrpms.net/
http://www.linux.cz/apt-rpm/ - Red Hat linux 7.x repositories (with all freshrpms included too!)
http://apt-rpm.tuxfamily.org/ - Red Hat linux 6.2, 7.x and 8.0 repositories
http://apt.nlc.no/apt/ - Red Hat linux 6.2, 7.x and Rawhide repositories
http://ftp.uninett.no/pub/linux/apt/ - Red Hat linux 6.2, 7.x, 8.0 and Rawhide repositories
http://redhat.usu.edu/ - Red Hat linux 7.2, 7.3 and 8.0 repositories
ftp://mirror.pa.msu.edu/apt/ - Red Hat linux 7.2, 7.3 and 8.0 repositories
http://apt-rpm.codefactory.se/ - Red Hat linux 7.2, 7.3 and 8.0 and gnomehide repositories http://apt.42h.de/ - Red Hat Linux 7.2, 7.3 and 8.0 repositories
http://apt.toggletext.com.au/ - A few Red Hat linux 7.2 custom packages http://people.ecsc.co.uk/~matt/repository.html - Lots of custom Red Hat Linux 8.0 GNOME 2 and related packages
http://ftp-stud.fht-esslingen.de/apt/ - Red Hat linux 7.x, 8.x and rawhide
http://apt.unl.edu/ - Red Hat linux 7.3 and 8.0
http://kde-redhat.sourceforge.net/ - KDE for Red Hat project
linux 常用軟件搜索
http://bingle.pku.edu.cn/ 北大天網ftp搜索，教育網和國內用戶查找軟件應首先訪問，軟件特別豐富
http://www.linuxforum.net/ 有很多國外軟件的官方鏡像，應首先訪問 http://rpmfind.net/
http://freshmeat.net/
http://sourceforge.net/
注：很多軟件主站是在sourceforge上的，形如http://phpmyadmin.sourceforge.net/的…籩苯酉略厝砑?/a> http://telia.dl.sourceforge.net/phpmyadmin/
http://www.gnu.org/ GNU的大本營，gcc，bash之類的軟件源碼可以到這裏得到 linux 文檔和FAQs
http://www.tldp.org/ 強烈推薦！ The linux document project: linux HOWTO and guides
http://www.linux.org.tw/CLDP/ 強烈推薦！ TLDP中文版，繁體
http://www.linuxgazette.com/ linux在線雜誌
http://linux.tcpip.com.cn/download/ linux中文版文檔和軟件下載
http://cosoft.org.cn/html/documents/ 很多中文版手冊
http://www.google.com/ 強烈推薦！本站的討論內容也可以通過google搜索得到，遇到疑難問題到google搜索會得到比絕大多數論壇更快的回答
linux 桌面主站一覽表
GNOME: http://www.gnome.org/
KDE: http://www.kde.org/
XFce: http://www.xfce.org/
Window Maker： http://www.windowmaker.org/
BlackBox: http://sourceforge.net/projects/blackboxwm
XPde: http://www.xpde.com/
ROX: http://sourceforge.net/projects/rox
5dwm: http://5dwm.org/
foXdesktop: http://sourceforge.net/projects/foxdesktop
EDE: http://sourceforge.net/projects/ede
UDE: http://sourceforge.net/projects/udeproject
其它OS：
Mandrake linux http://www.mandrakelinux.com/
debian linux http://www.debian.org/
slackware linux http://www.slackware.com/
suse linux http://www.suse.com/
FreeBSD http://www.freebsd.org/
netbsd http://www.netbsd.org/
openbsd http://www.openbsd.org/
Solaris http://www.sun.com/solaris 硬件和安裝專業站點
linux Kernel內核: http://www.kernel.org/
USB安裝問題： http://www.linux-usb.org/
筆記本計算機安裝： http://www.linux-laptop.net/
打印機驅動 http://www.linuxprinting.org/
主要服務器軟件主站
1. WWW server:
Apache http://www.apache.org/ Apache
SSL模塊Mod_ssl http://www.modssl.org/
aol server http://www.aolserver.com/
2. Servlets/JSP引擎:
Tomcat: http://jakarta.apache.org/
Resin: http://www.caucho.com/
開源應用服務器AS–Jboss: http://www.jboss.org/
3. 服務器語言:
PHP http://www.php.net/
Zend http://www.zend.com/
Java http://www.javasoft.com/
Python http://www.python.org/
Zope http://www.zope.org/
Perl http://www.perl.org/
Ruby http://www.ruby-lang.org/en
4. 數據庫:
MySQL http://www.mysql.com/
PostgreSQL http://www.postgresql.org/
Oracle http://www.oracle.com/
sap db http://www.sapdb.org/
PHPMyAdmin — http://www.phpmyadmin.org/
PHPPgAdmin: http://sourceforge.net/projects/phppgadmin
5. FTP服務器
wu-ftpd http://www.wu-ftpd.org/
Proftpd http://www.proftpd.org/
Pure-ftpd http://www.pureftpd.org/
ncftpd http://www.ncftpd.com/
vsftpd http://vsftpd.beasts.org/
6. SMTP服務器
Sendmail http://www.sendmail.org/
qmail http://www.qmail.org/
Postfix http://www.postfix.org/
Exim http://www.exim.org/
POP3–qpopper http://www.qpopper.org/
7. IMAP服務器
Cyrus-IMAPD http://asg.web.cmu.edu/cyrus/imapd
UW IMAP http://www.washington.edu/imap
courierimap http://www.inter7.com/courierimap
8. 基本安全工具
firewall Iptables: http://www.iptables.org/
shorewall: http://www.shorewall.net/
inetd Xinetd: http://www.xinetd.org/
Openssl: http://www.openssl.org/
OpenSSH: http://www.openssh.org/
nmap: http://http://www.insecure.org/nmap
Tripwire: http://www.tripwire.org/
snort: http://www.snort.org/
nessus: http://www.nessus.org/
GnuPG: http://www.gnupg.org/
chkrootkit: http://www.chkrootkit.org/
安全顧問： http://www.cert.org/
9. 其它服務器軟件
CVS–CVS http://www.cvshome.org/
DNS域名解析BIND http://www.isc.org/products/BIND/
DHCP–DHCP http://www.isc.org/products/DHCP/
INN新聞組INN: http://www.isc.org/products/INN/
Proxy代理緩存: Squid http://www.squid-cache.org/
Socks代理：http://www.socks.nec.com/
Samba Server: http://www.samba.org/
Print CUPS: http://www.cups.org/
LDAP OpenLDAP: http://www.openldap.org/
流量分析 MRTG http://www.mrtg.org/
日誌分析 webalizer http://www.mrunix.net/webalizer/
Ipsec/*** http://www.freeswan.org/
路由 Zebra http://www.zebra.org/
集羣 LVS http://www.linuxvirtualserver.org/
MPICH http://www-unix.mcs.anl.gov/mpi/mpich/
PVM：http://www.netlib.org/pvm3/
Rsync: http://rsync.samba.org/
linuxconf: http://www.solucorp.qc.ca/linuxconf/
Webmin: http://www.webmin.com/