DeepDive is a ruby gem that allows you to deep copy your object graphs in a controlled way. You can specify which instance variables to skip over in the duplication, which will just leave the original reference to them in the copy.
Create of Local Copy of the famous EMSL Basis Set Exhange. No more lag and a API for scripting.
Copy of the UI portion of the Ocean (very much in progress). Ember.js app.
A Firefox plugin to copy data from a CSV file into online forms.
An identi.ca/status.net client. Another copy of the repo may be found at https://gitorious.org/identicurse/