Recommended Apps for Phone/Tablet/Laptop

Asslamo Allaikum,

Please list your recommended Apps for Phone/Tablet/Laptop:

1. List the o/s
2. List the name
3. List the price
4. List what it does

Please merge this thread into an existing thread if there is one.

Jazakullah Khairun

I am back onto Windows with my Nokia Lumia 820 sold my Android for the time being and it is blazingly fast, responsive, 4G (LTE) with instant GPS Lock but I have no apps to report so far since I don't really have much experience with Windows.

Previously I recommend:

1. Android
2. Muftisays
3. Free
4. Easy to browse the forum, listen to Audios, read books and query the Halal list

Excellent, Masha'Allah.