Downloader Apps
Have you ever stumbled upon a listing of artwork, photos, or songs and thought to yourself “I wish I could download all of these, but having to click them one-by-one is too much”? This software category is here to the rescue! These apps allow you to download content in batches from countless websites, and with the ability to set custom rulesets and parameters to downloading behavior, to boot!
JDownloader 2
Bundleware
The installer contains bundled adware. Clean, adware free installers are available here: https://board.jdownloader.org/showthread.php?t=54725
JDownloader simplifies and improves the process of downloading files from sites like YouTube or Mega.JDownloader offers downloading in multiple parallel streams, CAPTCHA recognition, and automatic file extraction. It support CCF, RSDF and DLC files.
DownThemAll
Discontinued
The extension doesn't work on Firefox 57+ and Pale Moon 28+. The developer was working on a WebExtension, unfortunately last news dated back December 2017. The domain name downthemall.net expired on August 29, 2018 but it was reactivated after a week.
DownThemAll (or just dTa) is a powerful yet easy-to-use Mozilla Firefox extension that adds new advanced download capabilities to your browser.
Free Download Manager
FDM accelerates downloads by splitting files into sections and then downloading them simultaneously.
Wget
GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most widely-used Internet protocols.
Internet Download Manager
Internet download manager (IDM) is a tool to manage and schedule downloads. It can boost the speed of download up to 5 times.
aria2
aria2 is a multi-protocol & multi-source, cross platform download utility. The supported protocols are HTTP(S), FTP, BitTorrent (DHT, PEX, MSE/PE), and Metalink.
Orbit Downloader
Discontinued
The program was no longer updated since January 2014 (version 4.1.1.19) and the official website is no longer available.
Warning
It includes the adware OpenCandy which propose to install bad softwares, anyway declinable, but it's suspected of DDOS attacks from ESET too! Read comments for more information.
Orbit Downloader is a Download Manager for Windows with special focus on downloading content from social media websites like Myspace, YouTube, Imeem, Pandora and Rapidshare.
pyLoad
pyLoad is a fast, lightweight and full featured download manager for many One-Click-Hoster, container formats like DLC, video sites or just plain http or ftp links.
Bitport.io
Torrent safe, fast and from any device. Bitport.io downloads torrent files and keeps you anonymous at the same time.
FreeRapid Downloader
Discontinued
the latest version was published in 18th May 2014. See http://wordrider.net/download/changes.txt
FreeRapid Downloader is a simple Java downloader that supports downloading from Rapidshare and other file-sharing services.
Download Statusbar
Discontinued
The extension is no longer developed. Last version, 0.9.10, was released on October 28, 2011 and it was not available for Firefox 26.0
Download Statusbar: View and manage downloads from a tidy statusbar - without the download window getting in the way of your web browsing.
EagleGet
Bundleware
The installer may contain other softwares, like EagleGet iNewTab. Be careful during the installation: Forum
EagleGet is a free all-in-one download manager; it can be integrated to Chrome, IE, Firefox, Opera, offering support for HTTP, HTTPS, FTP, MMS and RTSP protocol as well as popular online video websites.
Origin
Origin is your new digital playground. It’s where you go to find the best that EA has to offer.
Mipony
Warning
Mipony installer will ask you to install other trial software, but application itself looks clean and does not do anything suspicious: https://www.virustotal.com/en/file/aeeffbbf7da49e3c87e4e2a065808eac918d0506ed05ee6c9ceb1dba9d7d7cc6/analysis/
Mipony, is a free software specially designed to download easily files from free hosting pages like Rapidshare, Fileserve, Hotfiles and many others.
FlashGot
Discontinued
The extension is currently not working on Firefox 57, it still works on lower versions: https://forums.informaction.com/viewtopic.php?f=6&t=23325&sid=00474d828d2582731536b4ea5146d5af
Download all the links, movies and audio clips of a page at the maximum speed with a single click.
Xtreme Download Manager
Xtreme Download Manager is a powerful tool to increase download speed up-to 500%, save videos from video sharing sites and integration with ANY browser.
Tucan Manager
Discontinued
The software seems abandoned and the official website is no longer available. Last version, 0.3.10, released on January 2011, and the source code can be still downloaded from Wayback Machine.
Tucan Manager is a free file sharing application designed for 1-Click Hosters. Fast and lightweight, Tucan is fully open-source and compatible with Windows, GNU/Linux, and MacOSX.
Persepolis Download Manager
Persepolis Download Manager is utility for download easier and faster with 
aria2 and improved it. - It supports HTTP(S) & FTP.
Internet Download Accelerator
Bundleware
The program automatically downloads and installs its addons on browsers without the user's permission
Internet Download Accelerator effectively solves three of the biggest problems when downloading files: speed, resuming broken downloads, and management of downloaded files.
Folx
Folx is a free application that combines two functionalities - of download manager and torrent client for Mac.