DCCP: a new transport layer protocol which draws from TCP and UDP
There's also SCTP:<p>Stream Control Transmission Protocol (SCTP) is a transport-layer protocol, serving in a similar role to the popular protocols TCP and UDP. It is standardized by IETF in RFC 4960.<p>SCTP provides some of the same service features of both: it is message-oriented like UDP and ensures reliable, in-sequence transport of messages with congestion control like TCP; it differs from these in providing multi-homing and redundant paths to increase resilience and reliability.<p><a href="https://en.m.wikipedia.org/wiki/Stream_Control_Transmission_Protocol" rel="nofollow">https://en.m.wikipedia.org/wiki/Stream_Control_Transmission_...</a><p>Edit: fix typo