wpspin

WooCommerce based plugin that replaces all images that are coming with WooCommerce by default with div element, thus avoiding any image resize conflicts. 
Note: You should have WooCommerce plugin installed to use it.

WC Catalog images to DIV convertor

This plugin replaces all images that are coming with WooCommerce by default with div element, thus avoiding any image resize conflicts.

Samuel Diethelm

Lightweight plugin to use remote images for post thumbnails and featured image. Enter remote image url into custom field ‘remote_thumbnail’ of any post.
Images will not be downloaded, therefore will not use up space from your hosting. In order to keep the same aspect ratio as an uploaded, cropped image with no distortion, the code generated will be an inline-block DIV with the image set as a background.

Remote Thumbnail

Lightweight plugin to use remote images for post thumbnails and featured image. Enter remote image url into custom field 'remote_thumbnail'  …

WC Catalog images to DIV convertor vs Remote Thumbnail