Generate EdgeCast access tokens in Ruby using EdgeCast's encryption algorithm in C.

Calculate edit distance (levenshtein distance)

Very fast and memory-efficient way to join ruby lists of numbers and strings.

Ruby bindings to the Eigen C++ linear algebra library

The gem that never forgets where your fonts are.

Can you embed a binary in a Gem? Can you distribute it to multiple architectures?

Ruby bindings for the envelopers envelope encryption library

Ruby library for Enzoic API

Tools to calculate Eddystone ephemeral identifiers

Ruby Extension that allows for reads and writes to the /etc user db.

Ethash is Ethereum's mining algorithm.

Trace your Ruby function's execution path

Exerb support for mingw/rubyinstaller. Packaged ruby source files and ruby extensions files into a single PE executable file.

Ruby EXIF geo tagger based on libexif.

extension tut

Watch directories using platform specific notifier.

This is a ruby interface for interacting with ezmlm-idx, an email list manager for use with the Qmail MTA, and the messages contained therein. (The -idx provides an extended feature set over the original ezmlm environment.)

Factorials as C extension.

Active Support impelementation in C for the ones who need for speed.

A naive bayes text classification algorithm built in C++, with a Ruby interface using Rice