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Spire is a numeric library for Scala which is intended to be generic, fast, and precise. Using features such as specialization, macros, type classes, and implicits, Spire works hard to defy conventional wisdom around performance and precision trade-offs. A major goal is to allow developers to write efficient numeric code without having to "bake in" particular numeric representations. In most cases, generic implementations using Spire's specialized type classes perform identically to corresponding direct implementations.

"Twitter's collection of LZO and Protocol Buffer-related Hadoop, Pig, Hive, and HBase code."

"Leaflet is a modern open-source JavaScript library for mobile-friendly interactive maps. It is developed by Vladimir Agafonkin with a team of dedicated contributors. Weighing just about 31 KB of JS, it has all the features most developers ever need for online maps. Leaflet is designed with simplicity, performance and usability in mind. It works efficiently across all major desktop and mobile platforms out of the box, taking advantage of HTML5 and CSS3 on modern browsers while still being accessible on older ones. It can be extended with many plugins, has a beautiful, easy to use and well-documented API and a simple, readable source code that is a joy to contribute to."

"This project aims at providing a Scala to JavaScript compiler, so that one can write the client-side of a Web application in Scala, and have it compiled into JavaScript code."

"Batman.js is a framework for building rich web applications with CoffeeScript or JavaScript. App code is concise and declarative, thanks to a powerful system of view bindings and observable properties. The API is designed with developer and designer happiness as its first priority."

Metrics is a Java library which gives you unparalleled insight into what your code does in production.

Jasmine is a behavior-driven development framework for testing JavaScript code.

"RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino and Node. Using a modular script loader like RequireJS will improve the speed and quality of your code."

Scala macros to generate wiring code for class instantiation. DI (e.g. guice) container replacement.

"Scalastyle examines your Scala code and indicates potential problems with it. If you have come across Checkstyle for Java, then you'll have a good idea what scalastyle is. Except that it's for Scala obviously."

"Scala macro that produces JavaScript from Scala code."

"Protostuff is the stuff that leverages google's protobuf. A serialization library with built-in support for forward-backward compatibility (schema evolution) and validation. available formats: protostuff (native) graph (protostuff with support for cyclic references. See SerializingObjectGraphs) protobuf json smile (binary json useable from the protostuff-json module) xml yaml (ser only) kvp (binary uwsgi header) support for messages that are generated by the protostuff-compiler (java_bean) cyclic references via graph format see CompilerOptions for more customized compilation of .proto files support for existing pojos (See runtime schemas) cyclic references via graph format polymorphic (a nested message can be an interface/abstract class or even java.lang.Object) support for existing protoc-generated java messages see the io instructions for json, xml, yaml) no support for cyclic references (limitation of the builder pattern) Interoperability across various mobile platforms android kindle j2me (protostuff-me module) Transcoding support converts one encoding to another. See PipeUsage. Source and Sink protostuff, protobuf, json, json-numeric, smile, smile-numeric, xml Sink only yaml "

"Rapture I/O is a fledgling library for Scala which provides a consistent, intuitive and extensible API for handling common I/O operations, such as sending HTTP requests and streaming data between files, URLs and sockets. Rapture I/O offers the functionality of java.io, but unifies its features into simpler, more coherent and higher-level concepts, allowing tasks which once took several lines of code to be often accomplished in just one, taking full advantage of Scala's rich syntax."

"Configuration library for JVM languages. Overview implemented in plain Java with no dependencies extensive test coverage supports files in three formats: Java properties, JSON, and a human-friendly JSON superset merges multiple files across all formats can load from files, URLs, or classpath good support for "nesting" (treat any subtree of the config the same as the whole config) users can override the config with Java system properties, java -Dmyapp.foo.bar=10 supports configuring an app, with its framework and libraries, all from a single file such as application.conf parses duration and size settings, "512k" or "10 seconds" converts types, so if you ask for a boolean and the value is the string "yes", or you ask for a float and the value is an int, it will figure it out. JSON superset features: comments includes substitutions ("foo" : ${bar}, "foo" : Hello ${who}) properties-like notation (a.b=c) less noisy, more lenient syntax substitute environment variables This library limits itself to config files. If you want to load config from a database or something, you would need to write some custom code. The library has nice support for merging configurations so if you build one from a custom source it's easy to merge it in."

"WSDL2Go code generation as well as its SOAP proxy"

"OSIN is an OAuth2 server library for the Go language, as specified at http://tools.ietf.org/html/rfc6749 and http://tools.ietf.org/html/draft-ietf-oauth-v2-10. Using it, you can build your own OAuth2 authentication service. The library implements the majority of the specification, like authorization and token endpoints, and authorization code, implicit, resource owner and client credentials grant types."

"This library provides a metrics package which can be used to instrument code, expose application metrics, and profile runtime performance in a flexible manner."