SEAL
A stream cipher by Phillip Rogaway and Don Coppersmith, tuned for fast software on 32-bit machines.
SEAL dates from the early 1990s and was aimed at 32-bit processors with plenty of RAM. Reported performance is around four cycles per byte. The design is a pseudorandom function family, so any part of the keystream can be computed without generating everything before it. That suits uses such as disk encryption.
Halevi, Coppersmith and Jutla proposed Scream as a more secure successor at roughly the same speed. Today ChaCha20 is the usual choice, but the principle of a stream cipher is the same.