Xero Bridge by Parex

One of the best apps I have used. This is a powerful and adaptable solution to quite a complicated problem of accounting for sales with or without vat - an issue for many international sellers. It’s well laid out, the architecture and options have been very well thought out, and has dealt with everything required of it very capably. It has taken a little setup to make sure it’s mapped right but the support is superb to guide you through this. The setup is a formality because once configured it runs automatically !

Of all the apps I have used this one stands out.