Code_Aster source files are stored into several repositories:

• src: source files (C, fortran, python), most of the verification testcases and build scripts (~350MB)
• validation: a few testcase files with non-public data (~1GB)
• data: data about materials that can not be freely distributed
• perf: this one containing some testcase files used for performance benchmarking.

Other independent repositories exist:

• devtools: contains helper scripts for the developers

The branches are:

• default: currently version 13, the development branch where the current work goes
• v12: version 12, the maintenance branch for the stable version 12
• v11: version 10, the branch for the old stable version 11

Each published version is tagged with its number. Examples: 12.3.8, 13.0.9.

Two tags are used aliases and moved when new versions are published:

• stable: the latest frozen state of the stable version in the maintenance branch (ex. 12.4.0).
• testing: the latest frozen state of the development version in the development branch (ex. 13.1.0).

Two names are often used in discussions to identify the code during its enhancements:

• unstable: the head of the development branch
• stable-updates: the head of the maintenance branch

Look at the doc/ directory in the source tree and the Wiki pages.