Workflow - Plugins - Component Report
The 'Component Report' Plugin generates a set of web pages to display all the Components within Workflow.
Workflow - Plugins - Encryption Keys Generator
The 'Encryption Keys Generator' Plugin allows you to generate a number of different types of keys, Symetrical and Asymetrical.
Workflow - Plugins - Export Translation Strings Plugin
The 'Export Translation Strings Plugin' Plugin ...
Workflow - Plugins - Create GUID
The 'Create GUID' Plugin allows you to generate a random GUID, which can then either be copied to the clipboard or added to the Primary Model of the current Workflow Project.
Workflow - Plugins - License Status
The License Status Manager lets you view licensing information about Workflow and Workflow-related applications (such as ServiceDesk). This tool also lets you run tests on your license to verify that it works properly. The tool does not create or manage licensing. The Symantec Management Platform manages all licensing. The tool communicates with the Symantec Management Platform to determine licensing information.
Workflow - Plugins - Generate Business Model
The 'Generate Business Model' Plugin allows you to add a custom Model to your Project which allows a process to be documented, this is not going to produce any code but is a great place to inform Developers who you wish the process to be work.
Workflow - Plugins
Symantec 
Workflow Manager has a number of Plugins available from install.
Workflow - Component - Developer Guide - WindowsForm
In this Article I'm going to explain how to add a Form to your Plugin to allow user interaction.
Workflow - Plugin - Developer Guide - Inspecting
In this Article I'm going to explain how to inspect other Plugins to learn how to implement items that aren't in the Developer Guide PDF.