Paperclip

This gem provides a simple and extremely flexible way to upload files from Ruby applications. It works well with Rack based web applications, such as Ruby on Rails.

Uppy is a sleek modular file uploader for web browsers. Add it to your app with one line of code, or build a custom version with just the plugins you need via Webpack/Browserify. 100% open source, backed by a company (Transloadit).

Uploadcare is file management platform and a CDN for user-generated content. It is a robust file API for uploading, managing, processing, rendering, optimizing, and delivering users’ content.

Filepicker helps developers connect to their users' content. Connect, Store, and Process any file from anywhere on the Internet.

Transloadit handles file uploading & file processing for your websites and mobile apps. We can process video, audio, images and documents.

A JavaScript library that can upload anything you throw at it, optimizes images for faster uploads and offers a great, accessible, silky smooth user experience.

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.

Bytescale is the best way to serve images, videos, and audio for web apps. Includes: Fast CDN, Storage, and Media Processing APIs.

Open protocol for resumable file uploads

The drop-in data importer that implements in hours, not weeks. Give your users the import experience you always dreamed of, but never had time to build.

With one line of code you can easily start collecting videos for applications ranging from video-comments to talent competitions, political action, virtual interviews, talent scouting and more.<br>

It is a File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.

It is a JavaScript file uploading plugin with 20+ plugins to choose, edit, and upload images to any backend. It's written in TypeScript, and is free and open-source.

It is a drop-in widget to allow your users to upload spreadsheets, map columns, and fix issues all with a few clicks. You receive clean and ready to use data in your app.

It is a high performant Vue file upload component with elegant and distinguishable previews for every file type and support for drag and drop, validations, default uploader with progress support and externally customizable in the "vue way".

It is a responsive file upload widget with free cloud storage. You can add file uploading to your app with only two lines of code. Customize the upload widget to integrate seamlessly with your existing UI. The upload widget accepts multiple file uploads, as well as dynamic image resizing. It's fast. It's simple. It just works.