ActiveSupport's delegation syntax is much more convenient than Ruby's stdlib Forwardable. This gem just extracts it as an independent functionality (available on-demand without monkey-patching Module).

DeploYML is a simple deployment solution that uses a single YAML file, Git and SSH.

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

Parser and builder implementation for EPUB CFI defined at http://www.idpf.org/epub/linking/cfi/

Parse EPUB 3 book loosely

Expectation library with some matchers for Ruby.

Ruby FFI library

Bindings to libpcap via FFI interface in Ruby.

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.

GScraper is a web-scraping interface to various Google Services.

Validate iTunes Transaction and Unified style receipts with local decoding and remote validation.

Load blog posts and other managed content into Jekyll

This gem allows you to interact with java key stores in pure ruby. Keys and Certificates are represented as OpenSSL objects

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

Mina plugin to provide local task hooks that run before and after the mina commands.

I like MiniTest. I like VCR. I like not having to manage cassetes.