See also:

• Computers: Software: Operating Systems: POSIX  (2)
• Computers: Software: Operating Systems: Realtime: TRON  (10)

• Integrity - Secure, no royalty, for high reliability embedded systems; hardware memory protection to isolate and protect it and user tasks from incorrect operation by errors or tampering; object-oriented design allows verifying data security/integrity, communications, individual components, whole system; strict adherence to provable resource requirements. Green Hills Software, Inc.
• Integrity (Operating System) - Growing article, with links to many related topics. Wikipedia.
• KROS - Small (12-64k), standards-based, low cost, no royalty, realtime OS; POSIX, ITRON/uITRON programming interfaces, GNU compiler support, source code provided; supports CPUs: Altera Nios, ARM, Hitachi SuperH. Free downloads: demos, documentation, updates. KROS Technologies, Inc. Commercial.
• MaRTE OS - Realtime kernel for embedded uses, follows Minimal Real-Time POSIX.13 subset. Most code is Ada, but some C, assembly. Hardware access via Abstract Hardware Interface (HAL). Runs in cross development environment: PC Linux Host, bare 386 PC Target, Ethernet LAN link. [Open Source, GPL]
• REAL/IX PX - A POSIX real-time operating system for x86/Pentium based systems. By Modcomp, Inc.
• S.Ha.R.K. - Dynamic configurable kernel architecture to support hard/soft/non realtime use with interchangeable scheduling algorithms: fully modular in scheduling policies, aperiodic servers, concurrency control protocols; all not modular in most traditional OSs. Derived from HARTIK: HArd Real TIme Kernel. [Open Source, GPL]