Messaging system based on the reactor pattern. You can publish messages to a queue and then a demultiplexer runs an event loop which pops items from the queue and hands it over to a dispatcher. The dispatcher hands over the message to the appropriate handler. You can choose your own queueing service.

Use your documentation as a specification

Easy multi-level DSLs, built on top of Docile

Parse EPUB 3 book loosely

Expectation library with some matchers for Ruby.

This is my personal library I use to share the Ruby tidbits and Rake tasks I made it for my various projects, and also to bootstrap easily several elements of my daily workflow (new git repository, new beamer slides etc.).

FFI plugin which adds support for bitmasked types (or flags) to FFI.

Ruby FFI library

Ruby FFI bindings to libextractor, a library for extracting metadata from a variety of file formats.

executes external programs with cron syntax.

copy http request. use shadow proxy server.

Downloads or plays Flash Video (flv) files directly from web-pages.

Got carried away a bit with the OOness of the whole thing, so while it won't be the fastest TFTP server it might be the most flexible, at least for pure-Ruby ones. With all the infastructure already in place adding a client should be a breeze, should anyone need it.

gce-metadata provides access to GCE instance metadata.

Encodes receipt data into iTunes encoded receipts and exports as appStoreReceiptURL or transactionReceipt formats.

Load blog posts and other managed content into Jekyll

Humane link urlifier

Create .torrent files easily with this gem. The code is ugly, but it works :)

Ruby version of a php library of the same name - http://mobiledetect.net/. Intended to be a nearly complete port, sharing data exposed by the php library

multi_markdown allows projects to use a wide variety of Markdown libraries, without having to depend on a specific one.