If you follow the link on http://wiki.eclipse.org/Git under "List of Git repositories available" (i.e. http://git.eclipse.org/) you can search for "e4" and get a list of repos.
The descriptions seems a bit of though -> making it a bit difficult to figure out which ones are relevant...
eclipse.platform.runtime.e4.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 20 months
eclipse.platform.ui.compat.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 20 months
eclipse.platform.ui.e4.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 20 months
org.eclipse.e4.deeplink.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 9 months
org.eclipse.e4.ff.git Temporary test repository for non-FF merges Paul Webster 5 months
org.eclipse.e4.installer.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 2 years
org.eclipse.e4.languages.git E4 languages repo: javascript Paul Webster 5 months
org.eclipse.e4.releng.git The E4 releng repo Paul Webster 4 days
org.eclipse.e4.resources.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 7 days
org.eclipse.e4.search.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 8 days
org.eclipse.e4.tools.git E4 tools: model editor, CSS Spy, CSS editor Paul Webster 5 days
org.eclipse.e4.ui.git UI test repo Paul Webster 9 weeks
org.eclipse.e4.utils.git Unnamed repository; edit this file 'description' to name the repository. Paul Webster 21 months
org.eclipse.e4.xwt.git XWT incubator Paul Webster 15 months
org.eclipse.jdt.core.git Eclipse JDT Core (e4 incubation and testing only) Boris Bokowski
org.eclipse.migration.git Migration steps for most of the Eclipse Project
Sopot Cela Messages: 448 Registered: December 2010
Senior Member
blablabla.tools contains the e4 tools (application model editor, css spy, live editor etc.) and blablabla.releng has the main poms if you want to build it yourself with maven/tycho.