Arduino is a microcontroller platform that offers similar functionality to LEGO Mindstorms in terms of building and programming interactive projects. While LEGO Mindstorms focuses on robotics kits, Arduino provides a more general-purpose platform for electronics and embedded systems development, making them a competitor in the educational robotics and DIY electronics space.

Raspberry Pi is a single-board computer that can be used for robotics and embedded systems projects, offering more processing power and flexibility than LEGO Mindstorms' built-in controllers. It can run full operating systems and supports a wider range of programming languages and libraries, making it a competitor for advanced robotics projects.