Future Tax — free tools share URL index
https://futuretax.in/tools/

  /seo/it-share-params.txt           Income tax (old/new regime, 80G, CG, flags)
  /seo/gst-share-params.txt          GST calculator
  /seo/emi-share-params.txt          EMI calculator (rich tabs)
  /seo/hra-share-params.txt          HRA exemption (Section 10(13A))
  /seo/advance-tax-share-params.txt  Advance tax instalments
  /seo/tds-rent-share-params.txt     Tenant rent TDS (194-IB)
  /seo/tool-state-keys.txt           Browser localStorage / session keys

Planning only — confirm on official portals before filing.