The official Wolfram Alpha app for Windows and Windows Phone is now free for a limited time.
Normally $2.99, the app has been discounted 100% for the next 2 weeks. It offers a definitive source for instant expert knowledge and computation with information and expertise across thousands of domains–with more continually added.
The service uses its vast collection of algorithms and data to compute answers and generate reports for you, and the app gives you full access to its power.
Find the app in the Windows Store here.