QBittorrent
What it is for. The download queue on the dashboard, and knowing whether a grab is actually progressing.
Cost. Free, self-hosted.
There is no API key. qBittorrent authenticates with the username and password of its web interface. If you are hunting its settings for a key, there isn't one to find.
Kustos can install it for you. On the qBittorrent card, Set up for me installs qBittorrent as a real Windows app, starts it when you sign in, and fills the connection in itself — so there is nothing to copy and nothing to type. It sets the username to admin, generates the password, and stores it for you. You will never be shown that password and you do not need it. If you want to open qBittorrent's own web interface yourself, do it from the machine Kustos runs on: Kustos leaves "bypass authentication for clients on localhost" switched on for exactly that reason, so a local browser is let straight in.
If you already have qBittorrent, connect it by hand instead:
- In Kustos, go to Connections and open the qBittorrent card.
- Put in the address of the qBittorrent web interface, as your browser shows it.
- Enter the username and password for that web interface.
- Press Save.
If a hand-connected one refuses, check two settings in qBittorrent under Options → Web UI: the interface has to be enabled, and if "Bypass authentication for clients on localhost" is on, qBittorrent is letting local browsers in without asking — so the credentials you think you are using may never have been tested. Kustos connects over the network like any other client, so it still needs a real username and password.