If you only need to learn the interface or practice data processing, the official CasaXPS demo is free to download.
If you cannot obtain a CasaXPS license through your institution, several high-quality free alternatives can perform similar peak fitting and quantification tasks:
The most common way to get a "free" license is through your university. Many research institutions around the world own .
: It is fully operational, allowing you to use all advanced curve-fitting and quantification tools.
: A newer free tool available on SourceForge that supports various file formats like VAMAS and Excel.
