Persepolis Download Manager - A really neat, FOSS, lightweight download manager for your needs.
Sorry for the question, but what even is the purpose of a standalone download manager?
Faster download speeds via multithreading, management of downloaded files, extra features like video stream capturing et al.
I see. I don’t personally see much use in it, but I can see how it can be nice.
Once you start downloading large videos off video websites, or large ISOs or ZIP/RAR/7Z files, you will quickly realise the worth. A lot of people who like to archive things, or store files or media locally, keep such a tool installed.
Good that another one came. I have been personally using Xtreme Download Manager across Linux and earlier Windows for better part of the decade, and it works extremely well.