tyfdesign

When activated, this plugin: 
1. Closes comments and pings on all existing public content (posts, pages, and custom post types). 
2. Sets WordPress defaults to disallow new comments and pings on all future content. 
3. Ensures that newly created or updated posts remain closed to comments. 
4. Hides the default Comments menu in the admin sidebar when enabled. 
5. Provides a simple Settings page with a single Activate / Deactivate button to toggle behavior.
When deactivated, the plugin restores the default WordPress discussion settings without reopening previously closed comments.
Created by TYF Design.

Do Not Allow Comments Everywhere

A lightweight plugin that globally disables comments and pings across all WordPress content - past and future.

pmcdotcom

vickybiswas

Extends wordpress disable comments functionality for individual post types. Selectively disable/enable comments on individual posts while having the power to choose a default settings for each post type.
The project is hosted on github 
https://github.com/vickybiswas/pmc-disable-comments 
feel free to fork and send pull requests.
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PMC Disable Comments

Default wordpress functionality for disable comments extended for post type based control.

Do Not Allow Comments Everywhere vs PMC Disable Comments