... third use. IndianBusinessTools ( indianbusinesstools.com ) is a free set of tools for that stuff: - GST calculator (updated for the GST 2.0 rate changes 0/5/18/40% slabs) - Invoice, quotation & purchase order generator PDF or Excel, GST or non-GST - HSN/SAC codefinder - TDS & professional tax calculators (state-wise) - Import/export duty calculator with landed cost breakdown - Rent agreement & business letter generator, MSME/Udyam checklist, e-way bill helper No signup, no watermark, and everything runs in your browser nothing you type gets ...