Why so many applications? o_O

[Stephen]

http://img714.imageshack.us/img714/259/heroapps.jpg
As you can see there are a bunch of different apps to open the client.??Why is this???Are there modifications to each one that make then unique???Thanks for any help clarifying this.

/GM-Aki Edit: Main forum rule
If you post a picture in a thread and the size is bigger than 640x480, put the link only without the [img] tags. AKA don't stretch the forum pages