The OpenSoC System Architect infrastructure has officially been released as an open source project. The code and IR specification has been released on Github under an Apache-2.0 license model. The code will be undergoing rapid development over the next 12 months as well as a dramatic increase in development infrastructure (tests, CI, etc). If you’re interested in contributing to the development, contact us via the mailing list here.
In the mean time, you can find the source code and IR specification here.