Free Download Manager is a download manager and download accelerator for Windows and Mac.
DownThemAll is a Firefox extension with a lot of features to help you download your favorite files in the browser.
JDownloader is a free and open source download manager with many features for Windows, Mac, and Linux.
FlashGet is a file download manager for Windows PCs.
TubeMate is a free YouTube video downloader app for Android devices.
BitTorrent allows you to download torrents and is available for multiple desktop and mobile platforms.