Aswath Damodaran, NYU Stern School of Business
Aswath Damodaran teaches corporate finance and valuation at NYU's Stern School of Business and gives away nearly everything he produces: datasets, spreadsheets, lecture webcasts and a long-running blog. His annual data updates and equity risk premium estimates are standard inputs for analysts building discount rates.
What they publish
Free industry-level data on costs of capital, margins, multiples, reinvestment and payouts, plus Damodaran's country risk premiums and monthly implied equity risk premium. The standard free source for discount-rate and comparables inputs.
Short-format video versions of Damodaran's NYU MBA classes in valuation and corporate finance, with slides and post-class tests. The best free valuation course available, and it starts from first principles.
Damodaran's blog, where he values companies in public, from IPO candidates to megacaps, and explains what each new market episode means for risk premiums, discount rates and pricing.