Download Sentinel++
This is an Anti-leech, download limiter / file manager, that uses tokens to verify downloads instead of HTTP_REFERER or IP which can be spoofed or changed. Good coding practice with modern PHP security. XHTML / CSS valid output. Easy to customize with html templates. Usage is dead simple, the included and auto-installed web page does everything for you. Extremely easy to manage all of your download files and very easy to work into your existing web page. Uses flat files so no need for an additional MySQL database. Just upload, run install, and you are done. It's that easy.