Web service testing tool

Try soapUI..
Explore here http://www.soapui.org/

Apache JMeter,

http://jakarta.apache.org/jmeter/

Web services in C++

Wondering how to implement web services in C++ applications?

Try gSOAP toolkit.
http://www.cs.fsu.edu/~engelen/soap.html
http://gsoap2.sourceforge.net

"With the introduction of the Windows Web Services (WWS) API, C++ developers no longer have to think of themselves as second-class citizens in the world of Web Services."

http://msdn.microsoft.com/hi-in/magazine/ee335693%28en-us%29.aspx

Visual Memory Leak Detector

This one really helped me ...try this for yourself....

http://www.codeproject.com/KB/applications/visualleakdetector.aspx

Free SSL/TLS toolkit

http://www.openssl.org/

"The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. "