From Free Computing:
Xtreme Download Manager is a powerful download accelerator and streaming video downloader for YouTube, Metacafe, Google Video, Daily Motion or any other website, integrates with any browser/application and schedule downloads. XDM uses sophisticated dynamic segmentation algorithm,data compression and connection reuse to speed up the download process. XDM supports HTTP, HTTPS and FTP protocols, firewalls, proxy servers, file redirects, cookies, authorization. XDM integrates with any browser to handle downloads automatically including Google Chrome, Internet Explorer, Apple Safari, Mozilla Firefox, Opera or any other application trying to download a file from internet.
What's new in this version:
Version 5.3.147 : Better support for downloading YouTube videos.
Better browser integration and some critical bugfix