Starting with GrandTotal 5 there is extensive support for analysis of your clients. You can access this features in the Overview Reports/Clients.
Clients can be filtered and sorted by client group, country and revenue. This lists can be saved for further processing in other applications like Excel using the menu File/Export.
In case you want to send a small courtesy to your customers, you can print the shipping labels directly from within GrandTotal. Templates for common Avery/Zweckform & Herma labels are built in.