Regarding regular expressions: One of my hobbies is doing a little PHP programming for three local websites. There are occasions when I stumble into the need to tinker with regular expressions. I like the app for that.
Regarding PDF Squeezer: The app does an unprecedented job to minify PDFs without compromising the quality of the file and the look and feel. It is just awesome and for the price in this bundle a steal.
Edit: topic about PDF Squeezer in this community.