Two interesting Lumia apps which you may really like and good thing is that both are free. Rotation lock takes care of one of the missing basic feature on WP and now you can lock the orientation in portrait or landscape mode. Catch is that you need GDR3 and you can perhaps read our article on how to get GDR3 for free on your WP8 device.
Another one is “Pin image to start” and allows you to pin wide image tiles. So, with great cameras on Lumia phones it is really a good application to have.
Thanks “Troll” for the Tip. Cheers!!