Link with Tuleap and Zammad

There is no specific integration with these tools.

Would it be possible to link Projeqtor with a specifq ticket or action type ?

No, not directly. Only possibility is to use ProjeQtOr API from Tuleap (needs some devs).

I'd like to be able to send ticket from zammad to Projeqtor and the other way around too.

From zammad to tuleap : same as above. Other way round : you can define a zammad resource, with email address to zammad and assign this resource to projects you want to communicate with zammad (and of course define events to send email in projeqtor).