https://play.google.com/store/apps/details?id=com.codeminders.cvar

  With this app you can hide and find virtual objects in the real world. Look through the camera of your 
  mobile phone and the object will appear at the exact location where it has been placed

by Ryan DH New

https://play.google.com/store/apps/details?id=com.androidyou.wifiloginnew

https://play.google.com/store/apps/details?id=org.crocodile.sbautologin&hl=en

https://play.google.com/store/apps/details?id=co.uk.syslynx.android.flashlingua

  FlashLingua - Makes learning foreign language vocabulary fast and easy (English, Spanish, and German).
  Intelligent flashcards allow u to hear the vocabulary spoken, and then test your knowledge of the 
  translation though voice recognition. 

http://www.makeuseof.com/tag/improve-wifi-experience-home-2-free-android-apps/