A gdb file extension is related to the ACT! and used for its group data.
There are 6 other file types using
the GDB file extension!
.gdb - Database file [common]
.gdb - GroupMail data
.gdb - Garmin MapSource GPS waypoint database
.gdb - Star Trek Elite Force II info file
.gdb - SmartWare business graph
.gdb - ArcGIS geodatabase
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What is gdb file? How to open gdb files?
The gdb file extension is associated with the ACT!, a personal contacts and information manager for Microsoft Windows operating system, developed by SAGE.
The gdb file stores group data from ACT!.
The default software associated to open gdb file:

Act! 
Company or developer:
The Sage Group plc
Act! is contact and customer manager that helps you organize contact information, manage daily responsibilities, and communicate more effectively. The latest version is 17.
Help how to open:
This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.
How to convert:
As far as we know, this .gdb file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.
List of software applications associated to the .gdb file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open gdb file, edit gdb file, convert gdb file, view gdb file, play gdb file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting gdb files.
Programs that can create gdb file - ACT! group data
Programs supporting the exension gdb on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Act! for create gdb file action.
Unspecified and all other actions for computer programs working with gdb file - ACT! group data
Click on the software link for more information about Act!. Act! uses gdb file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
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