More than two years ago the last version of the json4sapnw library was published. Json4sapnw is a Addon for ABAP based SAP NetWeaver systems and it is free for the SAP community.
The new version includes an HTTP client implementation to execute RESTful JSON Webservices with only a few lines of code. Some other optimizations and bugfixes are included too.
ADELE is a Java based tool for data analysis and comes with an SAP integration for exporting SAP data into ADELE. This is already published and known.
Starting from version 0.31.x data can be exported to SAP too. Export and import of data use RFC-enabled function modules with a very simple interface. Even ABAP newbies can implement this in minutes.