ACT! saves document templates with an ".adt" extension. They are used for creating multiple documents from a single format.

ACT! is a a popular Contact and Customer Relationship Management (CRM) software program developed by Sage. It can integrate with several other programs, but is most commonly used with Microsoft Word and Outlook.

AN AutoCAD ADT file is a text file that records the events that occur when a drawing audit is run. It lists all actions that occur and any errors that are detected during the audit. AutoCAD audit logs are named drawing.adt by default.

AutoCAD is a popular CAD design program for Windows. It can be used to create 2D and 3D models as well as architectural designs.