This is a collection of the tools/software developed in ATLAS for use in analysis. Mostly this is software specific to AnalysisBase, the dual-use architecture, and dual-use tools.
If you are new to ATLAS or analysis, it is recommended that you work through the tutorial first. Also, if you can, consider attending one of the ATLAS tutorial weeks (in person). These cover a large range of topics that will prove helpful during your analysis.
The goal is to migrate the documentation of these tools from the current TWiki format to the new atlassoftwaredocs format. However, this is still a work in progress, and you should always check the old documentation on the TWiki pages as well.