Ultimate (FREE) Open Source File Sharing Downloader

Application name: jDownloader
screenshot of jDownloader running under Ubuntu Hardy Heron (8.04):

Short description (by myself):

• All-in-one open source file sharing downloader.
• Works on Linux, Windows and Mac using Java Virtual Machine.
• Works whether you have FREE or Premium file sharing account.
• What I like most: scheduling and sequential downloader, no need to enter captcha for Megaupload and resumable download for free account on Megaupload.

Description from Homepage:
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. It offers downloading in multiple paralell streams, captcha recognition, automatical file extraction and much more. Of course, JDownloader is absolutely free of charge. Additionally, many "link encryption" sites are supported - so you just paste the "encrypted" links and JD does the rest. JDownloader can import CCF, RSDF and the new DLC files.

Features:

• Platform Independent. (Windows, Linux, Mac, ..)
• Runs on Java 1.5 or higher
• Complete Open-Source (GPL)
• 24-hour support
• Download several files parelel
• Download with multiple connections (like MSD)
• JD has an own powerful OCR module (JAntiCaptcha)
• Decrypt RSDF, CCF and DLC Containerfiles
• Decryptplugins for many services. e.g. sj.org, UCMS, WordPress, RLSLog....
• C.E.S: Use of the Russian Captcha Exchange Services possible
• Youtube video and Mp3 Download
• Automatic extractor (including password list search) (Rar & 7z archives)
• Theme Support
• Multilingual
• About 45 hoster and over 100 decrypt plug-ins
• Reconnect with JDLiveHeaderScripts: (1400 router supported)
• Webupdate
• Integrated package manager for additional modules

Download:
http://www.jdownloader.org/download