Moshi is a modern JSON library for Android and Java. It makes it easy to parse JSON into Java objects. It has has built-in support for reading and writing Java’s core data types like Primitives (int, float, char...), Collections, String, Enum. Moshi uses the same streaming and binding mechanisms as Gson. If you’re a Gson user you’ll find Moshi works similarly.

Moshi - A modern JSON library for Android and Java

 UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python 2.5+ and 3. For a more painless day to day C/C++ JSON decoder experience please checkout ujson4c, based on UltraJSON.

UltraJSON - Ultra fast JSON decoder and encoder written in C with Python bindings

DJSON is a JSON decoder for Go that is 2~ to 3~ times faster than the standard encoding/json and the existing solutions, when dealing with arbitrary JSON payload. It is a good approach for people who are using json.Unmarshal together with interface{}, don't know what the schema is, and still want good performance with minimal changes.

djson - Fast Go decoder for dynamic JSON

ServiceStack.Text is an independent, dependency-free serialization library that contains ServiceStack's text processing functionality, including: JsonSerializer, TypeSerializer (JSV-Format), CsvSerializer, T.Dump extension method, StringExtensions - Xml/Json/Csv/Url encoding, BaseConvert, Rot13, Hex escape, etc.,     Stream, Reflection, List, DateTime, etc extensions and utils.


ServiceStack text - NET's fastest JSON, JSV and CSV Text Serializers

A reference implementation of a JSON package in Java. The files in this package implement JSON encoders/decoders in Java. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL.

JSON-java - A reference implementation of a JSON package in Java

Jil is a fast JSON (de)serializer, built on Sigil with a number of somewhat crazy optimization tricks.

Jil -  Fast .NET JSON (De)Serializer, Built On Sigil

QJson is a qt-based library that maps JSON data to QVariant objects. JSON arrays will be mapped to QVariantList instances, while JSON's objects will be mapped to QVariantMap.

 QJson - Manage JSON objects with Qt

Json-lib is a java library for transforming beans, maps, collections, java arrays and XML to JSON and back again to beans and DynaBeans. 

Json-lib -  Java library for transforming objects and collections to JSON

Noggit is the world's fastest streaming JSON parser for Java. It is used in Apache Solr.
<BR>Its features include: <BR>
<ul>
<li>Fast!  Measured as the fastest JSON parser on char[], String input.</li>
<li>Streaming API (StAX/pull-parser like) for both easy and efficient parsing.</li>
<li>Conforms to JSON standard: <a href="http://www.ietf.org/rfc/rfc4627.txt">http://www.ietf.org/rfc/rfc4627.txt</a></li>
<li>Conforms to JSON standard: <a href="http://rfc7159.net/rfc7159">http://rfc7159.net/rfc7159</a></li>
<li>Memory efficiency:
<ul>
<li>Incremental parsing (Reader-based) in order to handle huge messages.</li>
<li>A single byte of state needed per nested object or array.</li>
<li>Doesn't read large objects (including primitives) into memory unless asked.</li>
<li>Can eliminate most copying, allowing user to provide value output buffers.</li>
</ul>
</li>
<li>Can handle primitives of any size (does not attempt to parse
numerics into a certain language primitive unless asked).</li>
<li>Simple serialization of objects (List, Map, etc).</li>
<li>Optional creation of objects (List, Map, etc) when parsing.</li>
</ul>

Noggit is the world's fastest streaming JSON parser for Java. It is used in Apache Solr.

Noggit - JSON streaming parser

A fast JSON parser and Object marshaller as a Ruby gem.

oj - Optimized JSON

JSONiJ is a JSON Parser, JPath Implementation and Marshaller implemented in Java. Its easy to use and it has good performance.

JSONiJ - JSON in Java

JSONSL is JSON Stateful (or Simple, or Stacked, or Searchable, or Streaming) Lexer.It is inspired by YAJL. It is Stateful, Decoupling Object Graph from Data, Callback oriented, selectively, Non Buffering, 

JSONSL - Embeddable, Fast, Streaming, Non-Buffering JSON Parser

sajson is an extremely high-performance, in-place, DOM-style JSON parser written in C++. Originally, sajson meant Single Allocation JSON, but it now supports dynamic allocation too. sajson parses an input document into a contiguous AST structure. Unlike some other high-performance JSON parsers, the AST is efficiently queryable. Object lookups by key are O(lg N) and array indexing is O(1).

sajson - Lightweight, extremely high-performance JSON parser for C++11

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