ST on Linux 

Available for 2.4 kernels
Supports ST over Ethernet and IP encapsulation
Zero-copy transmit on NICs supported by Linux zero-copy TCP patch
(Currently acenic, 3c90x, sunhme)
Zero-copy receive on acenic with modified firmware
Uses standard INET sockets (SOCK_SEQPACKET/IPPROTO_STP)
Beginnings of OS bypass support using libst