There are plenty of great productivity apps for every platform, but actually using and tracking those apps can become a hurdle to actually getting things done. Sean Oliver solved that problem by creating a "Do folder" of apps, and making some rules for what goes in that folder.
Making the folder is the easy part; it's the methodology of the apps included in the folder that is the real hack here. Oliver explains:
It's important to keep a few key "anchor apps" inside. Anchor apps are apps that you'll always use no matter what, because you have to (e.g. Mail and Calendar).
Then you add other apps that you want to use. Adding these apps in the Do folder with your other Anchor apps ensures you'll see them and reminds you to open them. It's a kind of halo effect, so I call them "Halo apps".
In his folder, Oliver uses Mailbox, Any.DO and Calendar as his Anchor apps and MyFitnessPal, Lift and Evernote as his Halo apps. You can play around with the combination, of course, but just keep in mind that the Anchor apps really are something you need to check multiple times in a day.