Hello,
The reporting tools for SAP BPC are.
1. MS Excel EPM Addin
2. BW Bex Reporting (Limited area of BPC data can be reported/queried in BEX for that Query development to be done as Bex consumes only Query. )
3. BO WEB-i (Backend settings to be done, Limited area of BPC data can be reported/queried in BO WEB-i for that backend settings are mandate. )
Apart of these I did not see any other Non-SAP reporting tools on BPC.
Hope this is helpful-Thank you