Genera (operating system)

Genera
Developer	Symbolics
Written in	Lisp
OS family	Lisp machine OS
Working state	Maintained
Source model	Source-available
Initial release	1982
Final release	Portable Genera 2.0 / 2021
Available in	English
Platforms	various Symbolics Lisp Machines,; DEC Alpha,; x86-64,; Arm64,; Apple Silicon M Series
Kernel type	Object-oriented
Default; user interface	Dynamic Windows GUI
License	Proprietary
Official website	symbolics-dks.com

Genera is a commercial operating system and integrated development environment for Lisp machines created by Symbolics. It is essentially a fork of an earlier operating system originating on the Massachusetts Institute of Technology (MIT) AI Lab's Lisp machines which Symbolics had used in common with Lisp Machines, Inc. (LMI), and Texas Instruments (TI). Genera was also sold by Symbolics as Open Genera, which runs Genera on computers based on a Digital Equipment Corporation (DEC) Alpha processor using Tru64 UNIX. In 2021 a new version was released as Portable Genera which runs on Tru64 UNIX on Alpha, Linux on x86-64 and Arm64 Linux, and macOS on x86-64 and Arm64 (Apple Silicon M Series). It is released and licensed as proprietary software.

Genera is an example of an object-oriented operating system based on the programming language Lisp.

Genera supports incremental and interactive development of complex software using a mix of programming styles with extensive support for object-oriented programming.