sharespring

Image resize service for web dev. 
Let our servers crop, compress, and deliver your images. 
Save time. Improve page speed. Crop automatically. 
Define image sizes in code and display everything at the right dimensions. 
We think this is how all sites should render images.

SwiftPic

Helper functions for image resizing in theme development using SwiftPic. https://swiftpic.io/

Dejan Batanjac

This simple WordPress plugin inserts smart jQuery code to your website header and makes old, non-responsive web sites automatically responsive. It doesn’t use Bootstrap, nor any responsive grid system.
The only requirement is JavaScript (jQuery) being enabled in your browser. If no JavaScrpt enabled, then the plugin will not have any impact.

Responsive

Resizes any non responsive web site, and makes it responsive with the simple trick of CSS scaling achieved using jQuery

SwiftPic vs Responsive