This add-on contributes a side-view named 'Writer Helper' that contains various small tools intended to help technical writers:

• Review - You can select folders or files in the Project view and start a review session for them. This is useful for reviewing a set of documents.
• Similar content - You can select folders or files in the Project view, then choose a list of elements to check for similarity. This is useful for finding possible elements that can be reused instead of being copy-pasted between documents.
• Read Aloud - You can select content in the current document and use the Play button to listen to how it is read by the operating system's narrator. This is useful for those who want to review content by listening to it.
• Tips - You can view a list of editing tips, tuned for technical writers. This is useful for discovering productivity tips to make your editing experience more efficient and productive.

More details about the add-on's functionality