Authen::Libwrap      (3)  - access to Wietse Venema's TCP Wrappers library
clock_getcpuclockid  (3p)  - access a process CPU-time clock (ADVANCED REALTIME)
nc                   (1)  - arbitrary TCP and UDP connections and listens
netinet/tcp.h [tcp]  (0p)  - definitions for the Internet Transmission Control Protocol (TCP)
pthread_getcpuclockid (3p)  - access a thread CPU-time clock (ADVANCED REALTIME THREADS)
stapprobes.tcp [stapprobes] (5)  - systemtap tcp probe points
tcp                  (7)  - TCP protocol
tcpd                 (8)  - access control facility for internet services
tcpdump              (8)  - dump traffic on a network
tcpslice             (8)  - extract pieces of and/or glue together tcpdump files