FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
Uploadify - Uploadify is a jQuery plugin that allows users to easily add multiple file upload functionality to their website.
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Fine Uploader - Javascript plugin tool to give your users a smooth experience when uploading files to your website.
Forklift - The most advanced dual pane file manager and file transfer client for macOS.
FancyUpload - digitarald:Harald K - Consultant & Contractor - FancyUpload - Swiff meets Ajax - Swiff meets Ajax for powerful and elegant uploads.