VTD-XML is a suite of innovative XML processing technologies centered around a non-extractive XML parsing technique called Virtual Token Descriptor (VTD).
an XML parser library written in C. It is a stream-oriented parser in which an application registers handlers for things the parser might find in the XML document
Expat is an XML parser library written in C. It is a stream-oriented parser in which an application registers handlers for things the parser might find in the XML document (like start tags)
M's JSON parser is a small library completely written in plain ISO C which handles documents described by the JavaScript Object Notation (JSON) data interchange format.
XML parser library in C. It is a stream oriented parser that requires setting handlers to deal with the structure that the parser discovers in the document.