A2 (operating system)
| Developer | ETH Zurich | 
|---|---|
| OS family | Oberon | 
| Working state | Current | 
| Source model | Open source | 
| Initial release | 2002 | 
| Repository | |
| Platforms | IA-32, x86-64, ARM, Cell | 
| Kernel type | Object-oriented | 
| License | BSD-like ETH A2 License | 
| Official website | gitlab | 
A2 (formerly named Active Object System (AOS), and then Bluebottle) is a modular, object-oriented operating system with features including automatic garbage-collected memory management, and a zooming user interface. It was developed originally at ETH Zurich in 2002. It is free and open-source software under a BSD-like license.