Protocol Buffers are Google's data interchange format.

Send RPCs from Ruby using GRPC

Ruby FFI library

Unicode Normalization Form support library for CRuby

We use this library at GitHub to detect blob languages, highlight code, ignore binary files, suppress generated files in diffs, and generate language breakdown graphs.

WebSocket protocol handler with pluggable I/O

MessagePack is a binary-based efficient object serialization library. It enables to exchange structured objects between many languages like JSON. But unlike JSON, it is very fast and small.

EventMachine implements a fast, single-threaded engine for arbitrary network communications. It's extremely easy to use in Ruby. EventMachine wraps all interactions with IP sockets, allowing programs to concentrate on the implementation of network protocols. It can be used to create both network servers and clients. To create a server or client, a Ruby program only needs to specify the IP address and port, and provide a Module that implements the communications protocol. Implementations of several standard network protocols are provided with the package, primarily to serve as examples. The real goal of EventMachine is to enable programs to easily interface with other programs using TCP/IP, especially if custom protocols are required.

bcrypt() is a sophisticated and secure hash algorithm designed by The OpenBSD project for hashing passwords. The bcrypt Ruby gem provides a simple wrapper for safely handling passwords.

A plain-Ruby implementation of GraphQL.

The fastest JSON parser and object serializer.

A fast, safe and extensible Markdown to (X)HTML parser

Use libsass with Ruby!

Ruby bindings to https://github.com/joyent/http-parser and https://github.com/http-parser/http-parser.java

stackprof is a fast sampling profiler for ruby code, with cpu, wallclock and object allocation samplers.

jaro_winkler is an implementation of Jaro-Winkler \ distance algorithm which is written in C extension and will fallback to pure \ Ruby version in platforms other than MRI/KRI like JRuby or Rubinius. Both of \ C and Ruby implementation support any kind of string encoding, such as \ UTF-8, EUC-JP, Big5, etc.

Rugged is a Ruby bindings to the libgit2 linkable C Git library. This is for testing and using the libgit2 library in a language that is awesome.

Ruby C bindings to the excellent Yajl JSON stream-based parser library.

ruby-prof is a fast code profiler for Ruby. It is a C extension and therefore is many times faster than the standard Ruby profiler. It supports both flat and graph profiles. For each method, graph profiles show how long the method ran, which methods called it and which methods it called. RubyProf generate both text and html and can output it to standard out or to a file.

Bindings for your Ruby exceptions