Apart from Apex, some widely used object-oriented programming languages include Java, C#, Python, C++, Ruby, Kotlin, Swift, PHP, and TypeScript. Key points about these languages: Java: One of the most popular object-oriented languages, known for its versatility and robust features. C#: Similar to Java, often used for enterprise applications and game development. Python: A beginner-friendly language with strong object-oriented capabilities, popular for data science and web development. C++: A powerful language with low-level control, often used for performance-critical applications. Ruby: A language known for its elegant syntax and focus on developer productivity. Kotlin: Primarily used for Android app development. Swift: Apple's primary language for iOS and macOS development.