Suggestions for tikz-relay

The following packages have something in common with the package tikz-relay. The packages are ordered in decreasing similarity.

Package tikz-sfc: Symbols collection for typesetting Sequential Function Chart (SFC) diagrams (PLC programs)
Package tikz-ladder: Draw ladder diagrams using TikZ
Package qworld: Drawing string diagrams for monoidal categories and quantum theory in TeX
Package duotenzor: Drawing package for circuit and duotensor diagrams
Package circuitikz: Draw electrical networks with TikZ
Package quantikz: Draw quantum circuit diagrams
Package tikzdotncross: Marking coordinates and crossing paths
Package tikzquads: A few shapes designed to be used with CircuiTikZ
Package yquant: Typesetting quantum circuits in a human-readable language
Package ladder: Draw simple ladder diagrams using TikZ
Package pmdraw: Draw elements of the diagram monoids
Package tikzphysics: TikZ-native shapes and anchors for classical physics diagrams
Package atomicreactions: Simple representation of atomic shell reactions and Bohr model
Package orbitals: Atomic subshell / orbital-box diagrams for LaTeX, with automatic electron filling following Hund’s rule and the Pauli principle
Package register-transfer-level: Easily generate high-quality, publication-ready RTL diagrams
Package stanli: TikZ Library for Structural Analysis
Package tikz-mirror-lens: Spherical mirrors and lenses in TikZ
Package tikz-karnaugh: Typeset Karnaugh maps using TikZ
Package tikz-sections: Draw structural cross-sections
Package bodeplot: Draw Bode, Nyquist and Nichols plots with gnuplot or pgfplots
Package bodegraph: Draw Bode, Nyquist and Black plots with gnuplot and TikZ
Package pfdicons: Draw process flow diagrams in chemical engineering
Package structmech: A TikZ command set for structural mechanics drawings
Package blochsphere: Draw pseudo-3D diagrams of Bloch spheres
Package kinematikz: Design kinematic chains and mechanisms
Package cartonaugh: A LuaLaTeX package for drawing karnaugh maps with up to 6 variables
Package karnaughmap: Typeset Karnaugh maps
Package karnaugh-map: LaTeX package for drawing karnaugh maps with up to 6 variables
Package grafcet: Draw Grafcet/SFC with TikZ
Package adigraph: Augmenting directed graphs
Package corasdiagram: A LaTeX package for authoring CORAS risk management diagrams