Since internalisation is a big topic here in lawpilots, we chose to use POEditor so we could delegate and separate the need for translations from the dev team efforts. Supporting more than 22 languages (and keeping at it, more languages are added frequently!), allowing 'automation' on our translations has been a huge help to us. POEditor providing us exactly that - using their web app we are able to provide access to colleagues outside the dev team and they are able to be manage existing or adding new languages autonomously. The integration with Bitbucket / github providing us PRs that we are able to review and approve easily.
We in lawpilots chose to use Asana for our cross-department communication and organizing our tasks. Although we are using Jira for dev tasks and all our agile needs inside the dev team, using Asana with non-technical teams have been very helpful and made the communication easier and faster. Our favourite feature of Asana is definitely the Asana forms which provides us the ability to receive feedback and requests from our colleagues in a constructive and productive way.
We chose to use Mailjet here in lawpilots because of numerous reasons. First of all, it was important to us to have the option to allow access and autonomy to different teams here in lawpilots to access the stats and configuration, which the simple yet powerful Mailjet GUI is providing. Secondly, it was essential to us (and our clients) to have an EU-based provider. In addition, Mailjet dev-focused offer provides a lot of convenience to the developers and it's versatile enough to provide solutions to all our mailing needs.