Do you receive many emails and want to answer them with a team of agents?
You’re going to love Zammad!
Zammad is a web based open source helpdesk/customer support system with many features to manage customer communication via several channels like telephone, facebook, twitter, chat and emails. It is distributed under the GNU AFFERO General Public License (AGPL) and tested on Linux, Solaris, AIX, FreeBSD, OpenBSD and Mac OS 10.x.
The code is open source, and available on GitHub!