Realtyna from Realtyna.com
The developer has stated that they are no longer supporting the Joomla version of the product, and in particular will not be issuing a security release for known sql injection vulnerabilities, see the live VEL listing: https://vel.joomla.org/vel-blog/2016-realtyna-rpl-all-versions-sql-injection