What Email app do you use on your mac?
I currently use Apple Mail, I have always used Apple Mail since I moved away from Microsoft Exchange back in 2007. I have tried out thunderbird both for windows and mac and have found it a great program. It works and the latest version looks great (mac version) The windows version (windows 8.1) is nice but there is something about thunderbird for mac which looks rather nice compared with windows. On their website they are advertising 10 years of thunderbird. So you are looking at a programme that has got 10 years of updates working with both POP3 and IMAP technologies from its infancy to where we are now.
I have seen Gimp on the machine for nearly 10 years. the tastes version was painless to install and works fine. It is also free to download and install. 
“Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get the most out of their computers every day.” Maintain.se
Converting your DVD library to digital: