Pomf is a simple lightweight file host with support for drop, paste, click and API uploading.

How to Upload a File to a Server in PHP

Simple File Uploading Software

Transloadit's official PHP SDK

A PHP class that makes handling uploads and file validation a lot simpler. You can use the chainable methods to set up the upload parameters such as min/max file size, mime types, and file extensions.

Resize Image Upload CodeIgniter

File uploads with validation and storage strategies

RemoteGrabberPHP is a lightweight, single-file PHP utility that allows users to remotely download files (especially `.zip`, `.rar`, etc.) by simply entering a URL. It provides file type and size info before downloading, supports resumable downloads, and is built to bypass typical PHP and web server limitations.