We've already discussed the gamified phone-tracking app Marco Polo, but the lost phone finder application recently underwent a massive update that enables it to help you find misplaced devices from your phone's screen. The Marco Polo app now includes an iOS 8 widget that will search for devices around you through the Notification Center in your iPhone.
The upgraded lost phone finder now comes with custom responses too. With the original version you would should "Marco" and your phone would respond with "Polo." Now you can create your own phrases. Both upgrades to Version 2.0 are ideal for families with multiple smartphones and devices in one area. The app also works for the iPod and iPad.
Misplaced Device Apps (UPDATE)
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App-Enabled Item Finders
Wireless Key Locators
Battery-Free Phone Finders
Glowing Internet-Detecting Swords