Flutter BuySell for iOS Android (Olx, Mercari, Offerup, Carousell, Buy Sell, Classified).
Demo: https://codecanyon.net/item/flutter-buysell-for-ios-android-olx-mercari-offerup-carousell-buy-sell-10-/26567412
PS BuySell is a ready-made Android application for message boards like Olx, Mercari, Offerup and Carousell.
Demo: https://codecanyon.net/item/ps-buy-sell-olx-mercari-offerup-clone-classified-app/24220109