Classima has a ReCaptcha control for reporting infringement, registration, listing, and a contact form.
Demo: https://themeforest.net/item/classima-classified-ads-wordpress-theme/24494997
Classima Classified ads mobile app is React Native based Android & iOS app for Classima - Classified ads WordPress Theme.
Demo: https://codecanyon.net/item/classima-classified-ads-android-app/30904046