Mac: If you're getting ready to set up a new computer or you need to format an old one, it's useful to get a quick glimpse at everything you have installed so you can easily reinstall those apps later. OS X Daily shows how to do it with a Terminal command.
Open up Terminal (Applications > Utilities) and type in:
sudo find / -iname *.app
This will display all the apps you have on your computer. From there, you can copy and paste the results into a text file to make it easy to start anew. You can always just make your own custom bulk app installer too.
How to List All Applications on a Mac [OS X Daily]