Part of the point of CipherSaber was that not only is RC4 trivial to implement, but it is feasible to do so entirely from memory. I can't think of any other cip

Part of the point of CipherSaber was that not only is RC4 trivial to implement, but it is feasible to do so entirely from memory. I can't think of any other cipher that comes close to that except for maybe XXTEA (and it's progenitors, TEA and XTEA). RC4 is so trivial that several people (including myself) were able to write implementations that fit in a single tweet.