Lightweight and flexible command-line JSON processor
C++ Qt ORM (Object Relational Mapping) and ODM library
TreeFrog Framework, High-speed C++ MVC Framework for Web Applications
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++
Small ANSI C lib for dropbox/windows azure communication
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