What is some open source tool where reporting can be done?
As SSRS is product from Microsoft, it comes up with some cost. However, there are certain reporting tools which are available in the market. Please find below list:
NextReports
Jasper Reports
Pentaho
QueryTree
SharpDevelopReports
Seal Report
ELK Stack
Spago BI
ReportServer
Helical Height
There are many more tools which you can use. However free tools come up with some limited functionality and support. So before moving them to production, always check the criticality of your business functions.