Any cipher can be broken given enough time.Some a few milliseconds like xoring with a rng,others longer than the lifetime of the sun given acces to every computer in the world.such as aes idea blowfish etc
you can read about some of the better stream ciphers here http://www.tcs.hut.fi/~helger/crypto/link/stream/
and remember that any block cipher can be transformed into a stream cipher.