Can I add a drop down menu in the Header for linking to our multiple language sites?

We have multiple sites in different languages and I want to link each one to the other. I have added flags in the top header to do this currently but I will run out of room soon and it won't be functional. Is there a way to add a drop down menu specifically for linking to multiple external sites, i.e. www.example.co.uk, www.example.eu, www.example.fr, etc. etc.

Thank you