Add custom links and other custom fields to WordPress Gallery images.
Select default settings for image link when you upload or insert images. Select default image link to None, Attachment Page, Media File or Custom URL.
Automatically Link images to none in selecting and uploading images in WordPress
Link Icons adds an icon next you your different types of links in your posts an pages
This plugin will simply stop WordPress automatically linking to image files / attachment pages when you insert an image into a post/page etc.