uC/os
FreeµC/OS-II and µC/OS-III are preemptive, highly portable, and scalable real-time kernels. You can test them out for free, but you must pay to put them into a product.
FreeFree tier
About uC/os
µC/OS-II and µC/OS-III are preemptive, highly portable, and scalable real-time kernels designed for embedded systems. They are part of the Micrium software suite by Silicon Labs, which also includes networking, communication stacks, and file system components. The kernels are ported to over 50 processor architectures and support automated project generation for Silicon Labs platforms. They can be evaluated for free, but commercial use requires a paid license.
Key Features
Preemptive multitasking kernel
Portable to over 50 processor architectures
Scalable design (µC/OS-III supports unlimited tasks and priorities)
Automated project generation for Silicon Labs platforms
Includes networking, communication stacks, and file system support (as part of Micrium suite)
Pros & Cons
Pros
- Highly portable across numerous architectures
- Scalable from small to complex systems
- Proven reliability and extensive documentation
- Free evaluation allows testing before licensing
Cons
- Requires paid license for commercial deployment
- Not fully open source under permissive license
- Learning curve for real-time kernel concepts
Best For
Embedded system developmentReal-time control applicationsIoT device firmwareIndustrial automationConsumer electronics with strict timing requirements