Must have Photo and Video Apps for your Android Samsung Galaxy S2 phone

The following at 4 tested apps on my Galaxy S2 Camera, that I consider essential, and which work very well:

'Little Camera'  (free) - A highly rated android photo app. From the app, it links you to your native camera app to take a photo, then allows you easily experiment with over 70 different filters and tools on the photo you've taken. You can layer different effects on each photo and it has a nice interface!

'Ultra Burst Camera' (paid) - Take up to 40 black & White photos per second with this tailored app. The app can take between 10 to 40 photos per second in black & white, depending on how high the resolution is set.

'Fast Burst Camera' (Free and Paid) - Can take up to 100 photos instantly, and can shoot 5 to 10 photos per second at 800x480. The paid version has 'Focus' and 'Flash' feature, so probably worth the 4 euro investment.

'IP Webcam' (Free) - Turns your phone into a wireless webcam for your computer or laptop. Can shoot at 640x480 resolution in landcape or portrait, and can use rear or front casing phone camera. Can enable audio too! Very useful!