Simple support system that can be as complex as you want as well.

It is our main point of contact for all customer requests and communication. It helps to keep communications with clients in a single place, instead of how we used to do it, which was using email, which gets very messy very quickly, and is hard for teammates to see the status of things. It also resulted in a lot of missed or forgotten emails.

The mobile app is great for keeping tabs on responses when away. Plenty of help articles to guide us on how we should be setting things up and best practices for ticket workflows.