RT is an industrial-grade trouble ticketing system. It lets a group of people intelligently and efficiently manage requests submitted by a community of users. RT is used by systems administrators, customer support staffs, NOCs, developers, and even marketing departments to track issues, outages, bugs, requests, and all kinds of other things at thousands of sites around the world.
Cerb is a fast and flexible Web-based platform for business collaboration and automation. It helps you remember anything about anyone, collaborate from anywhere, deftly reply to a flood of email, automate, stay informed, capture feedback, track time, flag opportunities, manage tasks, share expert knowledge, and otherwise execute efficiently.
OTRS is a platform independent Web-based help desk system that supports service organization of any kind (e.g. IT service, customer and technical product service, complaint management, public services, etc.) to increase their efficiency. It increases transparency as well as service quality and lowers your total cost of ownership. It has been certified ITIL V3 compatible by PinkVERIFY for incident, problem, change, service asset and configuration, request fulfillment, and knowledge management. Other ITIL processes like service catalog and service level management are supported as well.
Issue-Tracker is a support issue tracking system. The system is written to be user-friendly and is built around a modular API to make it easy to add to if need be. It includes many features that can help customer/technical support organizations resolve issues quickly and easily. These features include things like file uploads, email parsing, unlimited users and groups, email and SMS notifications, group and user reporting, and much more.
Haystack is a powerful tool designed to enable each and every individual manage all of her information in the way that makes the most sense. By removing the arbitrary barriers created by applications that only handle certain information "types", and recording only a fixed set of relationships defined by the developer, users can define whichever arrangements of, connections between, and views of information they find most effective. Such personalization of information management will dramatically improve your ability to find what you need when you need it.
MailManager helps teams deal with large volumes of email by allocating mail to the right person, providing tools to help answer it (prioritisation, reply templates, and a knowledge base), and allowing managers to set service levels for different types of mail and report on performance against service levels and volumes received. MailManager is based on Zope which is required to use it. It is cross-platform, but most of the testing has been under Linux and Mac OS X.