Some popular options:

1. **XRDTools**: XRDTools is an open-source MATLAB-based software for X-ray diffraction data analysis. It provides various functions for peak fitting, background subtraction, peak identification, and quantitative analysis. You can find more information and download the software from the XRDTools GitHub repository: https://github.com/kyr686/XRDTools

2. **GSAS-II**: GSAS-II (General Structure Analysis System) is a comprehensive open-source software package for X-ray and neutron diffraction analysis. It offers a wide range of analysis capabilities, including peak fitting, structure refinement, phase identification, and more. GSAS-II is written in Python and can be downloaded from the official website: https://subversion.xray.aps.anl.gov/pyGSAS/

3. **OpenXRD**: OpenXRD is an open-source software package written in Python for X-ray diffraction data analysis. It provides functionalities for peak fitting, background subtraction, peak indexing, and phase identification. OpenXRD is available on GitHub: https://github.com/APS-3ID-IXN/OpenXRD

4. **PyFAI**: PyFAI (Python Fast Azimuthal Integration) is a Python library for X-ray diffraction data reduction and analysis. It offers tools for azimuthal integration, calibration, and peak analysis. PyFAI can be used as a standalone software or integrated into other Python-based analysis workflows. You can find more information and download PyFAI from its official website: https://pyfai.readthedocs.io/

Hope it helps:credit AI

Dear Prof. Nuno Monge

You may find helpful information presented below:

Besides XRDtools, there are several free and open-source software options available for analyzing X-ray diffraction (XRD) data. Here are a few notable ones:

When using these tools, it's important to refer to the respective documentation and user guides provided by the developers to understand the functionalities and how to use them effectively for your specific analysis needs. Additionally, the choice of software may depend on the specific type of analysis you are performing and your familiarity with the software interface.

Thank you Mohammad Imam and Len Leonid Mizrah for your answers and insight.

Adxv is still available for free:

https://www.scripps.edu/tainer/arvai/

Thank you professor Andrew Arvai . I couldn't find it anywhere.