Gigastone/ Dane-Elec does not make any official recommendations or endorse any particular software. There are many available. For testing purposes and personal use, our technicians have evaluated and used several which they feel safe naming. The most robust so far is called "Zero Assumption Recovery". It can be found at http://www.z-a-recovery.com
For data recovery on a Mac, take a look at EaseUS Data Recovery Wizard.
Any software named here has no affiliation with Gigastone or Dane-Elec. We accept no responsibility regarding availability, cost, performance, or in any other way.