Which HelpDesc ​​(ServiceDesc) for a freelancer to choose?

Question

Helpdesk

Friends, I'm something of a freelancer.
I have several organizations in my service.
In order to keep at least some kind of accounting and transparency of my activities, not only for myself, but also for my clients, I need a thing close in functionality to HelpDesc ​​(ServiceDesc). You also need a truncated CRM functionality: address book, appeals, and more.
I would also like to receive reports from this thing about the work performed. Sending messages to E-mail.
Another requirement for the system: free. Those. best of all is an OpenSource solution that you can put on your server. Perhaps someone else is using something similar. Tell us about your experience.

Answer 1

OTRS, which was recommended above, is a support tracker. and you need a developer tracker - redmine, bugzilla, mantis. These are all OpenSource, but they require a tambourine of different sizes to install - redmine is written in Ruby, Bugzilla is written in Perl::Template. The interface is ugly for everyone, especially for bugzilla, redmine has a little better.

Answer 2

Bitrix24 Online Service which (you don’t need to install it yourself).
Unlike the classic Bitrix, which is scolded, Bitrix24 is a convenient thing.

Answer 3

ManageEngine ServiceDesk
has a free version both in the cloud and "on the ground"