http://gcc.gnu.org Home of the GNU Compiler Collection.
http://gcc.gnu.org/frontends.html Front ends for other languages available for GCC.
http://www.gnu.org/software/autoconf The Autoconf configuration utility.
http://gcc.gnu.org/java GCC's Java compiler, GCJ.
http://subversion.tigris.org The very well-designed Subversion site.
http://svnbook.red-bean.com/en/1.0 The online book, Version Control with Subversion.
https://www.cvshome.org The CVS site, secure and also well organized.
http://www.linux.ie/articles/tutorials/cvs.php A somewhat cheeky CVS tutorial.
http://eclipse.org The hub of the Eclipse community. Everything you need to get going and keep going.
http://www.eclipseplugincentral.com The place to find your needed Eclipse plug-ins, with news, too.
http://www-128.ibm.com/developerworks/java/jdk/eclipse/ The IBM Development Package for Eclipse. Includes the IBM Java Development Kit optimized for Eclipse.
http://www.kdevelop.org News, forums, documentation, and a real-time chart indicating the number of downloads per hour of this IDE.
http://anjuta.sourceforge.net The GNOME/GTK+ IDE.
http://www.digitalfanatics.org/projects/qt_tutorial Tutorial for C++ developers to learn Qt.
http://doc.trolltech.com/3.3 The official reference documentation for the current version of Qt.
http://www.rpm.org Home for information on the Red Hat Package Management system. The site includes an online version of Ed Bailey's 2000 book, Maximum RPM.
http://www.rpm.org/RPM-HOWTO An excellent guide to creating an RPM.