If you are using s2survey.net, there is a very basic analysis module that will present you descriptive statistics (frequencies, means, ...). This works directly in SoSci Survey.
If not, then you will need some external tools to do the job. Tools supported by SoSci Survey are SPSS, R, Stata and (by means of data downloaded as CSV file) Excel, Jamovi, and nearly any other statistical software. These are external tools from other providers that are not specific for SoSci Survey, but well suited to analyse the data collected with SoSci Survey.