Yes, we offer (mostly) fully functional two week trial versions. The downloads can be found in each add-ins Downloads tab, found in the detailed descriptions. For your convenience, we also have a list of all our downloads.
We say “mostly” because some limitations apply; for instance the Duplicate Eliminator series limits you to 100 duplicates removed, Send Individually will only allow you to send to 100 people before stopping, and the VCard Converter will only import (or export) 100 contacts before stopping. Otherwise, the add-ins are fully functional during the 14 day trial period.