C++ Sockets Library
A C++ class library wrapping the berkeley sockets C API, and therefore works on most unixes and also win32. Features include, but are not limited to, SSL support, IPv6 support, TCP and UDP sockets, HTTP protocol, and highly customizable error handling. [Open Source, GPL]
http://www.alhem.net/Sockets/

TCP/IP Raw Sockets
MSDN documentation about Raw Socket specification. Raw sockets can be used to create your own protocols.
http://msdn2.microsoft.com/en-us/library/ms740548.aspx

BSD Sockets: A Quick And Dirty Primer
Crash course in programming BSD sockets
http://www.ugu.com/sui/ugu/show?I=help.doc.network.sockets&F=1111111111&G=Y

Tooltronics, Inc.
TOOLTRONICS Inc. specializes in high current Kelvin test sockets, burn-in sockets and test fixtures, focusing on but not limited to the DC-DC/Power Converter market. The company has a strong 44 year track record.
http://tooltronicsinc.com/

Bulbtronics
Commercial Lighting, Commercial Light Bulbs at Bulbtronics. We are among the largest distributors of Commercial Lighting, Light Bulbs and Lamps.
http://www.bulbtronics.com/

Excel Cell Electronic
Manufacturer of DIP switches, terminal blocks and sockets, solid state, electromechanical and photo mos relays, and zif sockets and modular plugs.
http://www.ece-usa.com/

Simple Sockets Library
Sockets library for UNIX platforms that looks much like regular C-style i/o. [Open Source, Free]
http://mysite.verizon.net/astronaut/ssl/

Light Development
Open source applications and components for Java developers. SimplyHTML related tools. SocketTalk is a library of Java[tm] classes to simplify peer to peer communication through sockets. Resources.
http://www.lightdev.com/

Velocity of Light
Light source (macrosource) is a set of elementary sources which have different velocities in relation to inertial frame of the macrosource. Elementary light which is emitted by an elementary source has a strictly fixed speed c in relation to that elementary source in the moment of emission. Hereby follows that the macrosource is emitting lights that have different speeds in relation to its own inertial frame. Elementary light detector can only detect the light that in relation to it has speed c. Just that kind of light is detectable in the inertial frame of the elementary detector. The constancy of speed of light is only related to the detectable light and it is exclusivly the consequence of the strict detectors selectivity. Change of relative velocity between the light source and the detector can`t effect the detectors selectivity therefore the light speed that we detect in the inertial detectors frame is always the same. But every time another light is detectable depending on that relative velocity.
http://www.beotel.yu/~svetlost/

An Introduction to Sockets in C Through Annotated Examples
An introduction by example about sockets with the C programming language.
http://www.math.grinnell.edu/~walker/c/sockets-index.html