Econometrics
Causal Inference: The Mixtape by Scott Cunningham
Causal Inference Mixtape Sessions by Cunningham and Butts
Econometrics III Course by Ed Rubin
Applied Empirical Methods by Paul Goldsmith-Pinkham
Gary Chamberlain’s Grad Econometrics Course compiled by Paul Goldsmith-Pinkham
Statistical Learning and Causal Inference for Economics by Francis J. DiTraglia
Advanced Data Analytics in Economics by Nick Hagerty
Causal Inference for the Brave and True by Matheus Facure Alves
The Effect: An Introduction to Research Design and Causality by Nick Huntington-Klein
Also: The Effect: Videos on Causal Inferences by Nick Huntington-Klein
Applied Statistics Workshop Presentations from Harvard
Causal Inference Lectures by Ben Elsner
Advances in Difference-in-Differences in Econometrics by YoungStatS
Causal Econometrics by David Childers
Regression and Other Stories by Gelman, Hill, Vehtari
Instrumental Variables Workshop by Peter Hull
STAT 501: Regression Methods by Penn State Department of Statistics
PhD Econometrics Course by Stanislav Avdeev
Gov 2003: Causal Inference with Applications by Matthew Blackwell
Macroeconomics
International Macroeconomics and Trade Course by Jonathan Dingel
Intermediate Macroeconomics Course by Pascal Michaillat
Mathematical Methods for Macroeconomics by Pascal Michaillat
Monetary Policy, Inflation, and the Business Cycle by Jordi Gali
Modern Macroeconomics by Sanjay K. Chugh
Labor Economics
Graduate Labor Course by Florian Oswald
Key Papers Every Labor Economics PhD student should know by David Neumark (crowdsourced on Twitter)
Development Economics
Course Notes on Development & Metrics Grad Courses by Simon Quinn
Survey methods - curated blogs by Kondylis and McKenzie - posts on issues of measurement, survey design, sampling, survey checks, managing survey teams, reducing attrition, and all the behind-the-scenes work needed to get the data needed for impact evaluations
Technical Topics – Your One-Stop Shop for Methodology by Kondylis and McKenzie - posts on methodological issues in impact evaluation
An Introduction to Development Economics With a Focus on Data by Rachel Glennerster
How to Write the Introduction of Your Development Economics Paper by David Evans
Impact Evaluation in International Development : Theory, Methods and Practice by Glewwe, Todd
Introduction to randomized evaluations by Gibson, Sautmann, Feeney, Walsh
Public Economics/Policy
Program Evaluation for Public Service by Andrew Heiss
Teaching materials for Innovation: Market Failures and Public Policies by Williams, Bryan
Other
Course notes for UC Berkeley Econ Classes by Kristy Kim
AEA Continuing Education Courses
Health Economics Teaching Materials Repository by ASHEcon
Data Science in Economics course by Nick Hagerty - skills/tools that otherwise are only gained through RA experiences
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Note: I have compiled many open source courses and textbooks on data science/programming topics as well, and those can be found in the Data Science tab.