TestDisk and Photorec are two powerful applications for recovering data from corrupt drives including S.D. cards. Donation requested
Teamviewer is an excellent application provide an easy way to provide remote assistance or to collaborate on line. Free for personal non commercial use.
Treesize analyses the content of you drive and gives a graphical representation of the size of all folders. It is really useful when you are housekeeping, helping to identify large folders.