tcp

ZOIPER 2.0 Free Edition is a user-friendly softphone supporting IAX and SIP protocols. It is compatible with Asterisk and other IAX or SIP systems. Enjoy the benefits of this free product from Attractel!

This software provides a comprehensive SMTP email component that empowers various applications including ASP, VB, and VC++ to send rich TEXT/HTML emails with support for SMTP/ESMTP protocol. It is user-friendly and supports the IPv6 standard.

This software allows for network communication through a variety of protocols including HTTP, FTP, and SNMP. It also includes options for TCP client/server and Wake-On-LAN. Visit their website for examples in several programming languages.

Emsa Port Blocker is a customizable TCP blocking utility that blocks unwanted access to and from a computer. It functions similarly to a firewall but is not one.