The list of apps and websites compiled by BetaNYC here on GitHub include municipal government data feeds, safety data, media highlights, and of course a slew of “citizen built tools,” my favorite compilation.
In leu of an official CitiBike open data portal. Citizens are building their own open data systems. This is a collection of official and unofficial CitiBike NYC apps or tools. ( On Bike Share data tools and visualizations you will find a collection of other bike share tools and apps. A majority of them are open source. )
If you are a technical minded and want to join an email list dedicated to Citi Bike/BikeNYC hack, join the CitiBike Hacker email list.
Hat-tip to Dylan Felix for telling me about this list.