nix-topology is a NixOS-based tool that automatically generates infrastructure and network diagrams as SVGs from NixOS configurations. It uses a global topology module to aggregate information from multiple NixOS hosts, extracting data about interfaces, services, containers, and virtual machines via specialized extractors. The gathered topology is then rendered using ELK for layout and converted to SVG via custom tools (elk-to-svg and html-to-svg), producing both a physical connection diagram (showing nodes as cards with hardware and service details) and a network-centric view (showing logical networks and their connections). The architecture is modular, with clear separation between information gathering, topology aggregation, and rendering.