We can use magento2 marketplace and addons with third-party extensions.
And it will work for the admin only but they will not be accessible from the vendor panel of the marketplace
It means that the vendors will not be able to manage those 3rd party extension features.
Example – If you will use any other third-party auction plugin then the admin will be able to add auction but not the seller/vendor, in that case, you will have to use our Magento2 Seller Auction Marketplace Add-on.
Please do contact us for any further queries or requirements. You can also check our Magento 2 Extensions for additional features.