http://www.eclipse.org/

Eclipse is a multi-language software development environment comprising an
integrated development environment (IDE) and an extensible plug-in system.
It is written mostly in Java.

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http://lists.slackbuilds.org/pipermail/slackbuilds-users/2010-June/005979.html

edit
/opt/eclipse/eclipse.ini
and add the line:
-Dorg.eclipse.swt.browser.XULRunnerPath=/usr/lib/seamonkey
below the '-vmargs' line.

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+----------------------+
| Eclipse Update Sites |
+----------------------+

Helios Software Repository
http://download.eclipse.org/releases/helios/

MercurialEclipse
http://cbes.javaforge.com/update

PyDev
http://pydev.org/updates

Android Development Tools Plugin
https://dl-ssl.google.com/android/eclipse/

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+------------------+
| Eclipse Settings |
+------------------+

Window -> Preferences
General -> Editors -> Text Editors
x Insert spaces for tabs
x Show print margin
x Show line numbers