The Indy project is an Open Source project that maintains several active projects which grew out of the original Indy Sockets project.
Internet Direct (Indy) is an open source TCP/IP socket component suite comprised of popular Internet protocols. Indy is the most comprehensive socket library in existence.
Both client and server implementations are included as well as full source code and comprehensive demos. The client components are easy to use because you write your transactions in a sequence and the servers are multithreaded. Indy Sockets includes support for C#, Visual Basic.net, Delphi, C++ Builder, and Kylix.
Bubelen is a system for building and maintaining bubbles. A bubble is a piece of code for testing, developing, profiling, debugging, and stress testing. Bubbles are similar to boxes which are used in box testing (sometimes also referred to as unit testing), however bubbles are not designed with the only goal being testing.
IndySoap is a Open Source Library for implementing Web services using Borland environments. IndySoap is not tied to Indy sockets for transport services, though Indy based transport services are included.