what is the top torrent client, open source, not mainstream and is privacy first and jam packed with features.

One of the top open-source torrent clients that isn't mainstream, emphasizes privacy, and is feature-rich is **qBittorrent**. However, since you specified "not mainstream," you might find **FrostWire** to be a suitable option. While FrostWire started as a LimeWire alternative, it has evolved into a more privacy-focused torrent client with various built-in features. Another option is **webTorrent Desktop**, which is also open-source and focuses on streaming torrents and supporting privacy. However, the most recommended option you might be looking for is **Deluge**. Deluge is lightweight, highly customizable with plugins, and offers robust privacy measures, such as the ability to configure a VPN or proxy for added privacy while downloading. Lastly, **Tixati** is another less mainstream client that offers a plethora of features, including detailed bandwidth management and network settings, while maintaining a focus on user privacy. Make sure to combine any torrent client with a reputable VPN service to further enhance your privacy.