Another two application get the round up treatment.
Tetratrix : 66%
This is a simple edge matching puzzle game and is based on the original TetraVex game. It is a nice conversion of the game. The basic idea of the game is to put down the squares available, making sure that the numbers on all sides match the numbers of the square surrounding them. The application has several options of the number of tiles in the grid (3×3 being easiest up to 5×5 the hardest). There are lots of theme and colour options to tweak the user interface. If you like a simple brain teasing puzzle that you can play at your own speed then list one is well worth a download.
This application contains a digital copy of the American Declaration of Independence from July 4, 1776. If you are learning about the document or American Independence it is searchable and you can even email the contents out of the application. A simple application that students for one may find useful, but very much for a niche market.