What are some alternatives?
When comparing aria2 and qBittorrent, you can also consider the following products
JDownloader - JDownloader is a free downloading tool that enables you to download files from over a hundred hosting sites. The tool is compatible with Linux, Mac and Windows operating systems. Read more about JDownloader.
Transmission - Transmission has the features you expect in a BitTorrent client: encryption, a web-based interface...
Free Download Manager - It is a powerful modern download accelerator and organizer for Windows and Mac.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
Internet Download Manager - Internet Download Manager is an application that is designed to make downloading, organizing and storing your files a whole lot easier. If you are like many people, you might download a lot of files from the internet on a daily basis.
Vuze - Vuze is a free BitTorrent client used to transfer files via the BitTorrent protocol.