The latest stable version of Mahara is 15.10.0, released on 23 October 2015.
15.10
15.04 (security updates only)
1.10 (security updates only)
1.9 (no longer supported as of 27 October 2015)
1.8 (no longer supported as of 20 April 2015)
1.7 (no longer supported as of 21 October 2014)
1.6 (no longer supported as of 29 April 2014)
1.5 (no longer supported as of 29 October 2013)