Government Outreach - software solutions for 311, citizen relationship management, code enforcement.
ActiveGovernment - their software solutions provide 311 contact centers and support and citizen service management tools, as well as automated payment management and web content management.
AINS System 311 - Markets fully integrated, web-based, workflow-driven, case management system for handling citizen complaints and requests for information.
Publisafe - markets 311 Reports for handling 311 calls and related incidents
PHPOpen311 PHP library that works with V1 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)