Not usually — and be wary of anything that claims otherwise. “Open source” describes the licence on the code, not the price.
WordPress, WooCommerce and Magento are themselves free and open source, and the Sales Igniter rental engine is a one-time purchase rather than a monthly subscription, so there is no recurring software fee after you buy it. But it is not a zero invoice. What open source buys you is the source code, the freedom to modify it, and the absence of lock-in.
Current pricing is on the WooCommerce rental plugin page and the Magento 2 rental booking extension page.
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