OTRS is an Open source Ticket Request System with many features to manage
customer telephone calls and e-mails. It is distributed under the GNU
AFFERO General Public License (AGPL) and tested on Linux, Solaris, AIX,
Windows, FreeBSD, OpenBSD and Mac OS 10.x. Do you receive many e-mails and
want to answer them with a team of agents? You're going to love OTRS!

Feature list: see README