Occupy Wall Street's open-air encampments and spontaneous demonstrations through New York City have been largely organized through Facebook, Twitter and other social media. Now, protesters said, those tools are no longer enough.

A team of about 30 people has been working through the winter months, developing high-tech tools to help coordinate demonstrations that protesters will execute this spring and summer. From Internet maps tracking police barricades to a fundraising website, protesters said the technology will help sustain...