Eclipse Plugins
Plugings can be done as the user rather than from a system level.
CDT (C/C++)
Add http://download.eclipse.org/tools/cdt/releases/eclipse3.1 to the update manager and follow these intructions to get CDT: http://max.berger.name/howto/cdt/ar01s04.jsp
On SL5 the CDTR home page is http://www.eclipse.org/cdt/ and the URL for theupdate manager (Help->SoftwareUpdates) is http://download.eclipse.org/tools/cdt/releases/callisto
Core Tools
http://eclipse.org/eclipse/platform-core/updates
Photran (Fortran)
Download the photran-4.0-beta1.zip file from "Eclipse Features" section on the downlaod page of http://www.eclipse.org/photran/download.php. Unpack into a new directory and add that directory to the Update manager as a "New Local Site" then just follow the instructions as above.
PyDEV (Python)
Download the 3.1 beta2 zip file. Unpack into a new directory and add that directory to the Update manager as a "New Local Site" then just follow the instructions as above.
Aptana (AJAX: JavaScript, HTML, CSS)
See Aptana
EPIC (Perl)
See EPIC downloads section.
Subclipse (Subversion)
See Subclipse
Mylar
Name changed to Mylyn.
See Mylyn