Chris Klosowski

Allows you to upload your themes CSS, JavaScript, and Images into your Dropbox ‘Public’ folder and server these files from the Dropbox network, reducing the bandwidth of your server and allowing users to load your site faster. Please note that as of now, this plugin only supports themes who use the filters ‘template_directory’, ‘template_directory_uri’, ‘stylesheet_directory’, and ‘stylesheet_directory_uri’ to determine the paths to the theme’s template and stylesheet files. I would only suggest this plugin for users who aren’t afraid of getting their hands a little diry.
This plugin is in no way affiliated with Dropbox.

Dropbox CDN

Use your Dropbox 'Public' folder as a free Content Delivery Network (or CDN). Please read the full description.

tinytools

Delivering your image assets as fast as possible to users around the world is vital for your website’s success. This plugin replaces WordPress’ default responsive image behavior with the tiny.pictures cloud-based image processing service for optimized file sizes and response times.
Your image assets are run through our image scaling and optimization algorithms automatically before being delivered by lightning-fast caching nodes around the world. There’s no development necessary.
There’s a <a href="https://tiny.pictures/#register" rel="nofollow ugc">free plan</a> with 2 GB of traffic per month which is sufficient for most hobby projects. tiny.pictures can scale with you and offers plans for <a href="https://tiny.pictures/#pricing" rel="nofollow ugc">any amount of traffic</a> as your website grows.

tiny.pictures Image CDN

Scales and optimizes your images using the tiny.pictures image processing service in the cloud and delivers them through worldwide CDN nodes.

Dropbox CDN vs tiny.pictures Image CDN