InvoicePlane

Open Source

Quotes + invoices; 100k+ downloads

Details
LanguagePHP
LicenseMIT
Category: CPQ / Quoting / Proposals
OSS Maturity:Weak
Build note: Invoice Ninja covers quoting/proposals. ERPNext handles quotations and sales orders. True CPQ with product configuration rules remains a gap.
Gap:No open-source project offers true CPQ with complex product bundling rules and guided selling.