SVN:
http://subclipse.tigris.org/update_1.6.x
Google AppEngine:
Google AppEngine:
http://dl.google.com/eclipse/plugin/3.4
Maven2:
http://m2eclipse.sonatype.org/update/
I actually had to delete the eclipse folder and expand it from the tar, then I install all plugins each time saying NO to restart of Eclipse. After the last plugin installation I restart the Eclipse and all works fine.