Downloads are ZIP files of the script and any associated documentation. The MD5 hash value may be used to verify the integrity of the ZIP file.
Local Only, if checked, indicates a script that runs only against the local computer.
Stand Alone, if checked, indicates no supporting module is required.
Module Required and Module Version indicate which supporting module to use. Required modules are available here.
Finish Level indicates how ready a script is for use. Smooth indicates a script that has been used in production, and probably includes a ReadMe file. Other values imply an amount of effort required to produce production-ready scripts. They may just be examples of functionality.