Cbox Nexus — the US economic-nexus engine for Laravel: accumulate a seller's sales per state, detect when a post-Wayfair threshold is crossed, and report where registration is required.

Cbox Tax — a self-hostable consumption-tax engine for Laravel: it owns the calculation logic (place-of-supply, reverse-charge, rate application, inclusive/exclusive) per jurisdiction and sources only rate data behind a pluggable contract.