Hydra (operating system)

Hydra (stylized as HYDRA) is an early, discontinued, capability-based, object-oriented microkernel designed to support a wide range of possible operating systems to run on it.^[1] Hydra was created as part of the C.mmp project at Carnegie Mellon University in 1971.^[2]

Hydra
Developer	Carnegie Mellon University
Written in	BLISS
OS family	Capability-based
Working state	Discontinued
Initial release	1971; 54 years ago (1971)
Final release	Final / 1975; 50 years ago (1975)
Marketing target	Research
Available in	English
Update method	Compile from source code
Kernel type	Microkernel
Default user interface	Command-line interface

The name is based on the ancient Greek mythological creature the hydra.

Hydra was designed to be modular and secure, and intended to be flexible enough for easy experimentation.^[3] The system was implemented in the programming language BLISS.^[4]