FileStar - With FileStar you can "do anything with any file".
ImageKit.io - Instant multi-platform image optimization
NordLocker - Keeping files in the cloud? Protect them with leading-edge encryption. NordLocker makes file security easy.
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Storj.io - Storj DCS is a decentralized, encrypted and fast Amazon S3-compatible object storage.
Piio - Generates responsive images so you don't have to optimize