gSOAP Toolkit

The gSOAP toolkit is an extensive suite of portable C and C++ software to develop XML Web services with powerful type-safe XML data bindings. Easy-to-use XML auto-serialization allows you to directly integrate C and C++ (C++11 compatible) application data with XML. Includes WSDL/XSD schema binding and auto-coding tools, stub/skeleton compiler, Web servers (with SSL), integrated XML processing with schema validation, fast MIME/MTOM streaming, SOAP and REST, WS-* protocols (WS-Security, WS-Policy, etc), XML-RPC and JSON serialization. Free software under GPLv2 (many have asked about non-GPL/commercial licensing: yes there are basic low-cost licensing options starting at under 1K).