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JsonFx v2.0 - JSON serialization framework for .NET. It has unified interface for reading / writing JSON, BSON, XML, JsonML. It implements LINQ-to-JSON, Supports reading/writing using DataContract, XmlSerialization, JsonName, attributes and lot more.
Jackson is a multi-purpose Java library for processing JSON data format. This project contains core low-level incremental ("streaming") parser and generator abstractions used by Jackson Data Processor. It also includes the default implementation of handler types (parser, generator) that handle JSON format.
Socialauth provides support to authenticate users through external oAuth providers like Gmail, Hotmail, Yahoo, Twitter, Facebook, LinkedIn, Foursquare, MySpace, Salesforce, Yammer as well as through OpenID providers like myopenid.com. It could be easily integrated.
HBase provides support to handle BigTable - billions of rows X millions of columns. It is a scalable, distributed, versioned, column-oriented store modeled after Google's Bigtable and runs on top of HDFS (Hadoop Distributed Filesystem). It features compression, in-memory operation per-column. Data could be replicated between the nodes. HBase is used in Facebook and Twitter.
ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build and walk parse trees. Twitter search uses ANTLR for query parsing, with over 2 billion queries a day.