Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.

C XML Minimalistic Library (CXML) - An XML library for C with a focus on simplicity and ease of use.

Lightning fast JSON parser.

Lightning fast XML parser.

json parser with queue kind of callbacks (designed under influence of jsmn)

event-driven parsing XML document

Lua xml implementation based on libxml2.

Extensible markup language (XML) callback parser in one file.