SJR (Journal ranking)
QS Top Universities Ranking (University Ranking)
Investopedia (Learn finance)
NASA (Some climate data from the year 0!)
INOMICS (Economics course/program/job/conference, etc.)
IndexMundi (Macroeconomic data)
World Bank (Open Data)
Google Trends (Data & News)
Yahoo Finance (Data & News)
Stackoverflow (if you got a scientific question)
Bloomberg (News & Analyses)
Khan Academy (learn for free across different subjects)
Ben lambert (learn econometrics)
Jimmy Fallon (US Talk Show on YouTube)
Econometrics Academy (Learn Econometrics)
Kevin Sheppard (Python + Econometrics)
St. Louis Fed database (FRED Data)
www.comp-net.org (EU firm-level data, Free)
https://www.cftc.gov (commodities data)
Investing.com (financial data)
Stooq.com (financial data)