Alternativa is a platform based on flash. It provide a good solution for multiuser browser projects. but it is not a opensources project. The whole platform includes three parts:
- 3D – Alternativa3D is a 3D actionscript engine.
- GUI – AlternativaGUI provides simple API for building windows based user interface.
- core – AlternativaCore is server system that provides support for online multiuser media service.
the development blog and documentation is avaliable. there are some good example demo in the blog.