The build system supports testing and building LaTeX3 code, on Linux, Mac OS X and Windows systems. The package offers:

• A unit testing system for (La)TeX code (whether kernel code or contributed packages);
• A system for typesetting package documentation; and
• An automated process for creating CTAN releases.

The package is essentially independent of other material released by the LaTeX3 team, and may be updated on a different schedule.

The author is Joseph Wright. The package is Copyright © 2014 The LaTeX3 Project.