Protocol Buffers are Google's data interchange format.

Send RPCs from Ruby using GRPC

Ruby FFI library

Unicode Normalization Form support library for CRuby

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.

Use libsass with Ruby!

A suite of instrumentation metric primitives that can be exposed through a web services interface.

This gem implements bcrypt_pbkdf (a variant of PBKDF2 with bcrypt-based PRF)

A framework to implement robust multiprocess servers like Unicorn

TinyTDS - A modern, simple and fast FreeTDS library for Ruby using DB-Library. Developed for the ActiveRecord SQL Server adapter.

Ruby bindings to RE2, "a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python".

Cool.io provides a high performance event framework for Ruby which uses the libev C library

pycall

a fast strptime/strftime engine which uses VM.

rbnacl with bundled libsodium

Markdown processing for GitLab Flavored Markdown

Amalgalite embeds the SQLite database engine as a ruby extension. There is no need to install SQLite separately.

A Fresh new GraphQL server for Rails applications, with a focus on natural and Ruby-like DSL

This module allows Ruby programs to interface with "RSA Security Inc. PKCS #11 Cryptographic Token Interface (Cryptoki)".

Raygun application performance monitoring core Profiler