PHPOpen311 PHP library that works with V1 of the Open311 API.
RubyOpen311 Ruby library that works with V2 of the Open311 API.
Emergency / Crisis / Disaster Management and Global Efforts
Ushahidi - a platform that crowdsources crisis information. Allowing anyone to submit crisis information through text messaging using a mobile phone, email or web form.
Sahana - a Free and Open Source Disaster Management system. It is a web based collaboration tool that addresses the common coordination problems during a disaster
The Open ISES Project - Open Information Systems for Emergency Services including the Tickets open source Computer Aided Dispatch (CAD) program
SwiftApp - The SwiftRiver project expands Twitter Vote Report into a toolkit for crowdsourcing specific types of data (this could be anything from wait times at polling stations to activity during a crisis)