Yes, both WooCommerce and Slemma offer a Free Trial.
WooCommerce is designed for Large Enterprises, Medium Business and Small Business.
Slemma is designed for Medium Business and Small Business.
The starting price of Slemma begins at $89/Month when Billed Yearly, while pricing details for WooCommerce are unavailable.
Some top alternatives to WooCommerce includes PrestaShop, OpenCart, CS-Cart, X-Cart, Shopify Plus, BigCommerce, Square Ecommerce, Shopify, Ecwid, Magento Open Source, Web.com and HostRooster.
Some top alternatives to Slemma includes Alteryx, iDashboards, DataHero, Databox, DashThis, Klipfolio Dashboard, myDATA3, Easy Insight, AppInsights and Analytics Canvas.