Flutter and React Native have emerged as popular frameworks for developing cross-platform mobile apps, while new tools like .NET MAUI and Kotlin Multiplatform provide additional options. Cross-platform development prioritizes mobile-first design, uses cloud-based tools, incorporates AI/ML, focuses on security and performance, integrates third-party services, and utilizes low-code/no-code tools to build apps without extensive coding. It also integrates Internet of Things technologies to interact with connected devices.