Economics Web Institute
Freeeconomicsbooks.com
Classics
Principles of economics, by Alfred Marshall.
The general theory of employment, interest, and money, by John M. Keynes.
The wealth of nations, by Adam Smith.
Econometrics
Econometrics, by Bruce Hansen.
Time series for macroeconomics and finance, by John Cochrane.
Growth
Economic growth (2nd ed.), by Robert Barro and Xavier Sala-i-Martin.
Introduction to economic growth, by Daron Acemoglu.
International economics
International economics (6th ed.), by Paul Krugman and Maurice Obstfeld.
International macroeconomics, by Stephanie Schmitt-Grohé and Martín Uribe.
The economics of Keynes, by Mark Hayes.
Kalecki's economics today, ed. by Zdzislaw L. Sadowski and Adam Szeworski
Lectures on macroeconomics, by Olivier Blanchard and Stanley Fischer.
Monetary theory and policy (3rd ed.), by Carl Walsh.
Monetary economics, by Wynne Godley and Marc Lavoie.
Recursive macroeconomic theory (2nd edition), by Lars Ljungqvist and Tom Sargent. Exercises and solutions: Exercises in recursive macroeconomic theory, by Stijn Van Nieuwerburgh, Pierre-Olivier Weill, Lars Ljungqvist, and Tom Sargent.
Microeconomics
Microeconomic theory, by Andreu Mas-Colell, Michael Whinston, and Jerry Green.
Other
History of economic thought, by H. Landreth and D. Colander.
Living with water scarcity, by David Zetland.
The secret sins of economics, by Deirdre McCloskey.