apexrtos/apex

Apex RTOS is a legacy hobbyist project with minimal traction (34 stars) and zero current velocity. While building a POSIX-compatible RTOS is a significant technical undertaking, the project lacks a competitive moat. In the current landscape, it is heavily overshadowed by industry-standard projects like Zephyr (backed by the Linux Foundation), FreeRTOS (backed by AWS), and RT-Thread. These competitors offer vast driver libraries, commercial support, and massive ecosystems that Apex cannot match. The 'somewhat Linux compatible' angle is better served by the Preempt-RT patch for standard Linux or by more mature RTOSs with POSIX shims. Its low star count and age (nearly 6 years with no recent activity) suggest it is a personal experiment rather than a viable production-grade target. Frontier labs are unlikely to compete here as this is low-level embedded infrastructure far outside their core AI/LLM focus, but the project is effectively displaced by existing open-source RTOS giants.