A fast JSON parser/generator for Java.

simplejson is a simple, fast, extensible JSON encoder/decoder for Python

Alba is the fastest JSON serializer for Ruby.

An F# JSON parser & serializer.

C JSON parser (both, SAX-like & full DOM)

Custom JS object serializer and parser

mutils is fast serializer for Ruby Objects

Lightweight json library for C++

Bash Json Creator

one more java JSON parser/serializer (RFC 8259)

C JSON Streaming

Serialize any Ruby object as readable JSON

Fast lightweight and compact JSON serializer for .NET. Distributed as .NET library and C# source code.

Small helper creating original deep nested objects from json string