How to make photos look vintage (examples)?

I really need help on what websites, editing programs, iPhone apps i can use to make my photos look vintage-y.

Example:

http://theguiltymindofaninnocentwitness.tumblr.com/post/41190795913

http://m.weheartit.com/entry/43213930/via/vicoliveirab

And pictures like the ones on this instagram account.

http://inst.ag/u/orionvanessa/p/UwjFdbHUhf/

You should try picsart itz a real good photo app but I'm not sure if it's alsoa app for iPhone but I think so

I think the Rounds app has a few filters that are kind of "vintage-y" -- http://www.rounds.com

ETA: Ah, but it's not to edit photos you already took - it's to take pictures with the app and then apply that filter.

IPiccy photo editor is definitely for you. There you'll find everything you need and much more! (and it's free). Look for vintage section inside Effects tab