Best Open Source Download Managers

DownThemAll (dTa)
DownThemAll Firefox extension is a very powerful download manager. DownThemAll is an open-source downloading solution of images and linked files. It allows you to modify it according to your needs. It has a feature of filtration which assists to download specific things. DownThemAll can increase download speed up to 400% and used the multiparty download method. It also supported cross-platform and allows you to pause and resume downloads. It also provides the facility of integration you can integrate it on any browser.

Free Download Manager (FDM)
Free Download Manager is an open-source download accelerator and manager. FDM provides secure downloading and distribution under GPL license. It provides multiple features to its users like organize and schedule downloads, operate the program remotely and via the internet, adjusts traffic usage, resuming broken downloads, site explorer, adjusts traffic usage, Simultaneous downloading from several mirrors, download video from video sites, and many more. It also supports file splitting and download acceleration. It also provides a Portable facility instead to install the FDM to different computers make it portable. It is translated into 30 different languages.

Download Statusbar
Download Statusbar is a free and open-source Firefox's default download manager. It is a very comprehensive download manager which generates Statistics from download actions. Not only it download but also keep the history of your previous session downloads. It also provides an automatic scanning facility and provides the secure downloadable file. It also allows customization you can alter this extension according to your needs. Download Statusbar provides a number of features to their users like automatically close the download bar when downloads are completed and clear the download item after launching, download progress color and text color, drag and drop download item, resume context option and closing download bar automatically after a fixed time, privacy window support and many more features.