What pre-revenue financing options exist for startups?

Pre-revenue startups primarily access: personal savings and home equity, friends and family investment, angel investors, venture capital (for high-growth potential), government grants (SBIR/STTR for R&D companies), business incubator programs with attached funding, equipment leasing (no revenue required), and revenue advance programs once you have any sales history. Traditional debt financing is largely inaccessible without revenue.