Microsoft Office comes preinstalled in Windows Phone 8. Most of the people will benefit from it by reading their documents and spreadsheets right from their phones. The only app missing is Adobe Reader. You can install Adobe Reader to make sure you can download and open any kind of commonly used document formats.
You can also use other PDF Readers but Adobe Reader is far better and feature rich than others.
Windows Phone 8 comes with a camera with a bright flash light. This flashlight only lights up when taking a snapshot. You can use a free utility like Flashlight-X to use the flashlight as a torch. But be warned that the flashlight can drain the battery very quickly.