I get a fair few DMs asking where I get a lot of my data from, and whether I pay for any of it

I use solely freely available data, so here is a thread of some of my favourite sources (feel free to add your own)
https://www.transfermarkt.co.uk 
@Transfermarkt

-Massive volume of players past and present
-A somewhat usable valuation system
-Lots of player background details
-Basic match level data (goals, cards, PPG)
-A lot of youth football covered
http://nationalfootballteams.com 

-Career games, goals and clubs for every international footballer ever
-Thousands of lineups of international games
-Decent background data (POB, position, height, weight)
-List of clubs in practically every country and tier
-Finishing positions of clubs
https://www.whoscored.com 
@WhoScored

-Good coverage of event data for several leagues (and some international fixtures)
-Event data going back over a decade
-Live event data updates during games
-Proprietary rating that has some merits
https://www.playmakerstats.com/home.php 
@playmaker_EN

-Historical records of players stretching back many years
-Basic event data coverage for some leagues
-Nice selection of articles too
-Good database of youth club and international squads
-Futsal data
https://uk.soccerway.com 
@soccerway

-Huge coverage of leagues, including plenty of youth and womens
-Basic match data such as appearances, goals, cards
-Lacks a large amount of historical club data
https://www.footballdatabase.eu/en/ 
@footdatabase

-Most unique score is their "FBDB Index" which appears for every season for both players past and present
-Decent coverage of basic match data too
https://fbref.com/en/ 
@fbref

-Likely the best event data resource for free
-Excellent in depth top 5 league coverage
-Starting to add more historical data
-Sports Reference in general great (baseball, NFL etc)
https://understat.com 

-One stop shop for xG
-Coverage of big 5 leagues
-xG, xA, xPoints and some xG Chain stuff
https://smarterscout.com 
@smarterscout

-For maths nerds (myself included), a great place to take algorithmic ideas from
-Free plan more than useful
-Nice articles
-League adjustments
-Ratings for style and skill
You can follow @lgopfelix.
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