It is intended as an easy file attachment library for ActiveRecord. The intent behind it was to keep setup as easy as possible and to treat files as much like other attributes as possible.
Shrine implements a plugin system analogous to Roda’s and Sequel’s. Shrine ships with over 25 plugins, which together provide a great arsenal of features. Where CarrierWave and other file upload libraries favor complex class-level DSLs, Shrine favours simple instance-level interface.
Cloudinary is a cloud-based service that streamlines websites and mobile applications' entire image and video management needs - uploads, storage, administration, manipulations, and delivery.
Filepicker helps developers connect to their users' content. Connect, Store, and Process any file from anywhere on the Internet.
Uploadcare is a complete file handling platform for online business. Receive files from you users via File Uploader or File Upload API, implement image optimization and transformations with Image CDN API, and get HIPAA-compliant storage.