A range of plugins are included in PDF-XChange Editor, and you can view them in the Plugins category of the Preferences section of the user interface, available via the File tab:
All plugins are detailed in the Available Plugins window:
You can use the check box next to each plugin to enable/disable them in PDF-XChange Editor, and you can click plugins in the Available Plugins window to view their Filename, Description, Legal and Copyright information in the Plugin Information section of the user interface.
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