HelenOS
| Example applications | |
| Written in | C | 
|---|---|
| OS family | Multiserver operating systems | 
| Source model | Open source | 
| Initial release | June 11, 2006 | 
| Latest preview | 0.14.1 / 19 May 2024 | 
| Repository | |
| Package manager | coastline packages | 
| Platforms | IA-32, AMD64, IA-64, ARM, MIPS, PowerPC, SPARC V9, RISC-V | 
| Kernel type | Microkernel | 
| License | BSD-3-Clause | 
| Official website | www | 
HelenOS is an operating system based on a multiserver microkernel design. The source code of HelenOS is written in C and published under the BSD-3-Clause license.
The system is described as a “research development open-source operating system”.