
Here are some powerful, easy-to-use and absolutely free download managers for windows and Firefox. Moreover, these are safe and some are open-source softwares which also supports various protocols and has excellent file management features. Check out the list below:
JDownloader

JDownloader is open source, platform independent and written completely in Java. It simplifies downloading files from One-Click-Hosters like Rapidshare.com or Megaupload.com – not only for users with a premium account but also for users who don’t pay.

wxDownload Fast (also known as wxDFast) is an open source download manager. It is multi-platform and builds on Windows(2k,XP), Linux and Mac OS X(binary still not available).

VDownloader is a powerful tool that can search, download and convert videos from Youtube, Google Video, Metacafe, MySpace, DailyMotion, Pornotube, Yuvutu, and many other similar sites, saving them in AVI or MPG format. It is also a powerful video converter.

IE7Pro is a must have add-on for Internet Explorer, which includes a lot of features and tweaks to make your IE friendlier, more useful, secure and customizable.

Fresh Download is an easy-to-use and very fast download manager that turbo charges downloading files from the Internet, such as your favorite mp3 files, software, picture collections, video, etc.

MLDonkey is a multi-platform multi-network peer-to-peer client.

Free Download Manager is a powerful, easy-to-use and absolutely free download accelerator and manager. Moreover, FDM is 100% safe, open-source software distributed under GPL license.

LeechGet is a download manager that uses a very nice, modern, Microsoft Outlook-like user interface and seamlessly integrates into Internet Explorer, allowing you to easily start and manage your downloads.

Gwget it’s a download manager for the Gnome Desktop. By default, gwget tries to continue any download. Gwget detects when you put a html, php, asp or a web page dir in the url to download, and ask you to only download certain files (multimedia, only the index, and so on).

Aria2 is a multi-protocol & multi-source, cross platform download utility. The supported protocols are HTTP(S), FTP, BitTorrent, Metalink. It can download a file from multiple sources/protocols and tries to utilize your maximum download bandwidth.

FlashGet is a leading download manager and has the highest amount of users on the internet. It uses MHT(Multi-server Hyper-threading Transportation) technique, supports various protocols and has excellent document management features. FlashGet is a freeware without any adware or spyware.

WideStream is a download manager and FTP manager which main targets are speed, ease of use and rich functionality. WideStream supports multi-threaded downloads, download by ranges, direct and indirect HTTP downloads, HTTP redirects, FTP downloads, network traffic management, download priorities, host manager and offers rich configurability and easy to use and user friendly UI.

Orbit Downloader, leader of download manager revolution, is devoted to new generation web (web2.0) downloading, such as video/music/streaming media from Myspace, YouTube, Imeem, Pandora, Rapidshare, support RTMP. And to make general downloading easier and faster.

DownThemAll (or just dTa) is a powerful yet easy-to-use Mozilla Firefox extension that adds new advanced download capabilities to your browser. It lets you download all the links or images contained in a webpage and much more: you can refine your downloads by fully customizable criteria to get only what you really want.

Star Downloader is a download manager that accelerates your downloads by splitting the files into several parts and downloading them simultaneously. Download speeds are increased further by choosing the fastest mirror sites.
TrueDownloader is a open source download manager/accelerator with good features like Pause/Resume downloads, simultaneous downloads, segmented downloads for acceleration . Both HTTP and FTP protocols are supported , and it’s very fast!

FlashGot, the best Firefox download manager integration, has been honored in the May 2006 issue of PC World, the most widely-read computer or business magazine, as one of the “101 Fabulous Freebies”

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