Green Hills Software is a provider of high performance compilers, software development tools and real-time operating systems (RTOS) for developers of embedded systems.

The company's velOSity microkernel is small, fast, and royalty-free, making it ideal for cost-sensitive applications. The royalty-free Integrity RTOS is the only commercial RTOS suitable for systems demanding total reliability and absolute security. The company's MULTI and AdaMULTI development environments, coupled with a suite of optimizing compilers, increase programmer productivity, reduce development cost, and speed time-to-market.