Ruby

Loose Change is a GeoCouch-aware, ActiveModel-compliant Ruby ORM for CouchDB. There's a demo app available here .

Flotilla is a Rails plugin to bring the beautiful charts of the jQuery flot plugin to your ActiveRecord models. Visit the rubyforge page for more details.

Cartographer brings painless Google Maps to Ruby on Rails. See the GitHub page to get started.

Erlang

Erlang_twitter is a library for communicating with Twitter from Erlang.

Erlang-ruby-marshal lets you serialize and deserialize Ruby objects in Erlang.

Github

All my open source work is available on Github