TreeFrog Framework, High-speed C++ MVC Framework for Web Applications
C++ Qt ORM (Object Relational Mapping) and ODM library
Library to parse and emit YAML, and do it fast
Web Framework built on top of Qt, using the approach of Catalyst
Web Framework to build REST APIs, Webservices or any HTTP endpoint
Development toolkit for Web Services and XML data bindings for C & C++
EXI implementations in Java and C#
ZET-JSON is C++ library for json format.
Open-DIS implements the IEEE DIS protocol in multiple languages.
Simple viewer app for most Booru Sites, coded in Qt C++
Another C++ based JSON Library (/w Parser/Generator/Navigator)
A JSON parser written in ISO C
A web-browser based viewer for opensim/OpenSimulator
Simple JSON API for Qt4