Module Bazaar is described as 'Buy and sell products on one of the leading online eCommerce marketplace for Magento extensions, PrestaShop, OpenCart, WordPress, Joomla modules'. There are six alternatives to Module Bazaar for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Magento Community Edition, Windows and Linux. The best alternative is TemplateMonster Magento 2 Extensions. It's not free, so if you're looking for a free alternative, you could try Debutify. Other great apps like Module Bazaar are Apptha Marketplace (Paid, Open Source), Knowband (Paid), CedCommerce (Paid) and Softprodigy (Paid).
Magento 2 offers unparalleled functionality and customization potential for your store. Given our design and development experience, we couldn’t simply pass by this great opportunity to offer our solutions for the Magento 2 community.
Apptha Marketplace is a readymade b2b/b2c Multi vendor script built on Magento 1 & Magento 2 and it is cloud ready as well. Packed with 3 free add-ons (Social Login, One-step checkout, Super Deals) the script offers 1 year free cloud hosting on Amazon Cloud environment.