Alternative to Photos

Hi there.

I currently own an iPhone 5C and have the latest iOS version installed.

I love taking photos and i love sharing them. So, i'm looking for a very good free (or paid) app that is alternative to the Photos app of the iPhone in which i can do some more editing (more than basic or intermediate level controls but less than expert) and one in which i can share it with more ways like via Google+, Youtube, Dropbox, etc.

Thanks.