All downloads are provided under the terms and conditions of the Eclipse Foundation Software User Agreement unless otherwise specified.
m2e is tested against Eclipse 4.4 (Luna).
See http://wiki.eclipse.org/M2E_updatesite_and_gittags for detailed information about available builds and m2e build repository layout.
m2e 1.3 and earlier version have been removed from the main m2e update site. These old releases are still available and can be installed from repositories documented in http://wiki.eclipse.org/M2E_updatesite_and_gittags
Please note that links below point at Eclipse p2 repositories; you must access them from Eclipse (see how).