JDownloader 2 is a cross-platform download manager/web site scraper written in Java and available for Windows, Mac and Linux-based computers. With plugins to help users retrieve the contents of nearly every major multimedia web site with a minimal amount of effort, it's a powerful tool that will improve almost anyone's online experience.
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Pro Click and Load
Jdownloader can crawl all links and find downloadable content based on those links, very helpful to download entire website content, video playlist, or hidden content too.
There is no limitation.
Pro Supports multiple parallel streams
It means you can download any stream source such as youtube or similar video site with options to choose its quality and filetype.
Pro Captcha recognition
You can input captcha on some free file hosting sites directly on Jdownloader.
Pro Auto-extracts archives
No need to manually extract your downloaded archives, while Jdownloader can automatically extract them for you.
Pro Auto-saves to configured folder
Automatically save files with certain filenames to certain preconfigured folders.
Pro Batch import links
Helps to batch download files.
Because JDownloader runs on Java, any platform that can run Java, can run JDownloader.
Pro Advanced packaging system
You can pack files into packages for better file management.
Con Regular installation tries to install Adware along with program
Oughta look for the ad-ware free installer. Dubious.
Con Not safe
It seems like VirusTotal has detected something with a scan. : https://www.virustotal.com/es-ar/file/c3467621d7f2479bac6fba7afae7b32bc5f3b25f61c562543ab498cdd9c5e33c/analysis/1550301403/ .
Con Apparently not fully open source
Con ULTRA extreme file fragmentation
There is no file size allocation protocol to prevent file fragmentation. And declared that there is no plan to fix it.
Con Has ads
Which is on by default but can be disabled in advanced setting.
Con Captcha solving requires Browser extension which spies on you
Con Resource intensive
It is a Java application so you will always having the JavaVM(Java virtual machine) running alongside.