I use Instagram. There I said it. There has been a lot said about whether instagram is good or bad for the photography world, but I for one, really like the images that can be made with instagram. Sometimes though I have normal camera images taken with DSLR or even with my normal camera app, rather than with instagram. These are a problem! I want to instagram-ify them!
At last now I can. Take a look at XnView: http://www.xnview.com/en/index.php. The product is called XnRetro.
It’s also something that is available for lots of different platforms.