Any downloader that has similar functionality and layout like https://alternativeto.net/software/internet-download-manager/about/.
...All free and open source
With this app, you can easily download files from anywhere. Enjoy fast, free downloads with seamless browser extension support.
No YouTube support, the dev refused to implement it due to legal reason. have huge memory footprint (200MB+)
KGet is a versatile and user-friendly download manager for KDE. By default it is the download manager used for Konqueror, but can also be used with Mozilla Firefox. KGet is part of the KDE Network package and can download files from FTP, HTTP(S) and BitTorrent sources.
FlameGet is a modern, lightweight GTK4 download manager designed specifically for the Linux desktop. By wrapping the power of Aria2, cURL, and yt-dlp into a sleek graphical interface, FlameGet ensures your downloads are handled efficiently, organized instantly, and accelerated...
Persepolis Download Manager is utility for download easier and faster with 
aria2 and improved it.
Low memory footprint (~20MB) Imprefect video detection?
...time to fork?
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.
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