Hello,
I’d like to show you my last project built on Yii2 : EasyAds - Complex Classified Ads Application
EasyAds is a Unique Complex Classified Ads Application that is great for almost any case of use from massive market place with different categories to a unique niche market, like auto.
Main Features:
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Personal account and business account with store option
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Multiple payment gateways integrated (Braintree, 2Checkout, Stripe and PayPal)
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Invoice system
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Email system to handle parallel emails with email queue and templates integrated.
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Admin roles for separate group access privileges.
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Classified ads packages for promoting different type of listings.
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CMS integrated for pages/blog articles
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Tax system
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Localization with multi currencies, countries and zones
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Overall ready to translate module
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Extension manager
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Ad tracking system including social shares.
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And much more, you can check out here: click here
Everything built in the wonderful Yii framework 2, very clear and elegant.
Just a heads up, it is not free, but not expensive either 
If you have questions please let me know,
Thanks!