The development of OpenIndiana is focused on the  Openindiana hipster rolling-release distribution.

While previous development releases (/dev) were produced by a release engineering from a different software consolidations, a unified build system oi-userland, is used now to build Openindiana hipster (/hipster), as explained on Building with oi-userland and Github page oi-userland . 

The instructions for Building the Operating System have links to the active source repositories as well as old (/dev) consolidation repositories.

Openindiana hipster

 OI hipster repository Changelog
Latest news and history of updates

Tasks for upcoming snapshots
Contributing to hipster

How to join the development of OI hipster

 Building with oi-userland
Packaging with the unified build system