Checkmk is a comprehensive Solution for IT Monitoring of applications, servers, and networks.
Jackett works as a proxy server: it translates queries from apps (Sonarr, Radarr, SickRage, CouchPotato, Mylar, DuckieTV, etc) into tracker-site-specific http queries, parses the html response, then sends results back to the requesting software.
Deluge is a BitTorrent client written in Python. Deluge is cross-platform, using a front and back end architecture where libtorrent, a software library written in C++ which provides the application's networking logic, is connected to one of various front ends through the project's own Python bindings