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)

United Nations' database

Philadelphia Fed (Data)

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)