Horizon is an Electronic Design Automation (EDA) tool for circuit board design. It manages the full design flow from schematic entry to gerber export. The main differentiator from KiCAD is a different (more sane) part library design. It is quite new software in 2018 so may have rough edges but is already very capable.
Notable features: * Sane library management * Unified editor for everything from symbol to board * Netlist-aware schematic editor * KiCad's awesome interactive router * Lag- and glitch-free rendering * Rule-based DRC * Undo/redo * Copy/paste for some objects * Builds and runs on Linux and Windows