Most free GST/invoicing tools in India are bait for a CA firm's lead form — enter your numbers, get a call instead of an answer. IndianBusinessTools skips that: 17 tools covering GST/TDS/professional-tax calculation, HSN/SAC lookup, GSTIN validation, and document generation (invoices, quotations, purchase orders, rent agreements, business letters) — no account, no watermark, no data leaving your browser. Built solo, still adding tools based on what people actually ask for.