Example:
python otp_decrypt.py orig/1 ciphers/ | xxd -r -p > wut
This example is for volga ctf cry200. Rotate the caesar cipher with:
http://www.xarg.org/tools/caesar-cipher/
Also this explains everything about OTP: http://crypto.stackexchange.com/a/6095. Another good explanation: http://travisdazell.blogspot.de/2012/11/many-time-pad-attack-crib-drag.html
We use probability here, though.
Keystream (correctkey) is from here.
Also I've seen this http://blogs.gnome.org/muelli/2012/05/breaking-multiple-time-pad/ and maybe it's cool? This also looks promising: http://cryptosmith.org/archives/70