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    * [redbooth.com](https://redbooth.com) — P2P file syncing, free for up to 2 users
    * [cloudinary.com](https://cloudinary.com/) — Image upload, powerful manipulations, storage and delivery for sites and apps, with libraries for Ruby, Python, Java, PHP, Objective-C and more. Perpetual free tier includes 7,500 images/month, 2 GB storage, 5 GB bandwidth
+   * [piio.co](https://piio.co/) — Responsive image optimization and delivery for every website. Free plan for developers and personal websites. Includes free CDN, WebP and Lazy Loading out of the box.
    * [gumlet.com](https://www.gumlet.com/) — Image resize-as-a-service. It also optimizes images and performs delivery via CDN. Free tier includes 1 GB bandwidth and unlimited number of image processing every month for 1 year.
    * [plot.ly](https://plot.ly/) — Graph and share your data. Free tier includes unlimited public files and 10 private files
    * [transloadit.com](https://transloadit.com/) — Handles file uploads and encoding of video, audio, images, documents. Free for Open Source and other do-gooders. Commercial applications get 1 GB free for test driving