"Ridr" is an Android app that provides a vast marketplace for horses, ponies, and riding equipment. Designed for horse lovers, it allows users to easily create ads and connect with buyers and sellers. Features include horse-specific searches, buyer/seller evaluations, Facebook validation, and a chat function for direct communication. Users can also view pedigrees and receive activity notifications, making it a comprehensive tool for all equestrian enthusiasts. Best of all, it's completely free!