OpenSalesTax tax provider for Medusa v2 — self-hosted US sales-tax calculation. Apache 2.0.
PHP SDK for the OpenSalesTax engine — open-source US sales tax calculation API
Sidecar webhook listener that adds destination-based US sales tax to Invoice Ninja v5 invoices via the self-hosted OpenSalesTax engine
Magento 2 module for destination-based US sales tax via the self-hosted OpenSalesTax engine
OpenCart 4.x extension — destination-based US sales tax via the self-hosted OpenSalesTax engine. Apache 2.0; calculation only; no per-transaction fees.
Vendure plugin for destination-based US sales tax via the self-hosted OpenSalesTax engine
Python SDK for OpenSalesTax — calculate US sales tax via the v1 HTTP API
Drupal Commerce 3.x tax type plugin for destination-based US sales tax via the self-hosted OpenSalesTax engine. Calculation only; the merchant remits.
WooCommerce plugin: replace TaxJar/Avalara/WooCommerce Tax with self-hosted OpenSalesTax — destination-based US sales tax at checkout
Bagisto package: destination-based US sales tax via the self-hosted OpenSalesTax engine
Server-side TypeScript library for destination-based US sales tax on Square Orders + Invoices via the self-hosted OpenSalesTax engine. Apache-2.0.
Saleor Tax App connector — destination-based US sales tax via the self-hosted OpenSalesTax engine
Destination-based US sales tax for ERPNext via the OpenSalesTax engine
WHMCS addon: replace WHMCS's built-in tax handling with self-hosted OpenSalesTax — destination-based US sales tax on hosting invoices.
QuickBooks Online sidecar: replace Intuit Automated Sales Tax with self-hosted OpenSalesTax — destination-based US sales tax on QBO invoices.
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