BiglyBT is a torrent client written in Java, forked from Vuze and Azureus. It claims to be full of features, including one that I haven’t seen in other clients yet: swarm merging, which tries to download the same file from multiple torrents.
Even though it is a GUI application, the GUI can be disabled and it can run with a console UI plus a web UI. There are even a few attempts of writing a docker container, and this one is the most recent one (but still one year old).
I think this can be a good addition to the existing list of downloader containers from LSIO.