Here is the list of every Wordle clone I know of – 50+ and counting! To my knowledge, all are free to play. I have not tried them all. Creating this post made my head spin. lol
These are alphabetically-ish organized, in that they are loosely alphabetized but might also be grouped due to similarities, or the most well-known one in the category might be on top, etc., etc.
(Am I missing something cool? Send me a line!)
Words
Wordle (the OG)
https://www.nytimes.com/games/wordle/index.html
Waffle (letter swapping in a waffle-shaped grid)
https://wafflegame.net/
Dordle (Wordle x2)
https://zaratustra.itch.io/dordle
Quordle (Wordle x4)
https://www.quordle.com/#/
Octordle (Wordle x8)
https://octordle.com/
Sedecordle (Wordle x16!)
https://www.sedecordle.com/
Absurdle (an “adversarial version of Wordle” that actively avoids giving you the answer)
https://qntm.org/files/absurdle/absurdle.html
Adverswordle (Wordle in reverse – the AI tries to guess your word)
https://adverswordle.doteye.online/
Reversle (Wordle in reverse – start with the answer)
https://reversle.net/
Crosswordle (guess the Wordle for each down and across word)
https://crosswordle.mekoppe.com/
(there appears to be another game by this name at https://www.crosswordle.app/, but when I checked, it wasn’t working.)
Hello Wordl (a straight-up clone of Wordle? not sure)
https://hellowordl.net/
Speedle (a fork of Hello Wordl, with more options)
https://tck.mn/speedle/
Hurdle (5 puzzles in one – 5th is comprised of prior 4)
https://www.arkadium.com/games/hurdle/
Letterle (single letter guess)
https://edjefferson.com/letterle/
Lewdle (the “bad word” game)
https://www.lewdlegame.com/
Sweardle (guess the “four-letter words”)
https://sweardle.com/
Queerdle (“yassification of Wordle” – words related to LGBTQ+)
https://queerdle.com/
Scholardle (“Wordle for researchers” – academic words related to scientific texts)
https://www.scholardle.com/
Semantle (semantic similarities)
https://semantle.novalis.org/
Squabble (Wordle meets Battle Royale – beat the other players)
https://squabble.me/
Squardle (a 5×5 grid with six words in it)
https://fubargames.se/squardle/
Survivle (your goal is to lose!)
https://lazyguyy.github.io/survivle/
Wordle Survival (race against the clock)
https://www.breakwordle.com/
Math(s)
Nerdle (hidden calculation equation – multiple games by this name)
https://nerdlegame.com/
https://nerdlegame.org/
Mathle (“mathy” words)
https://www.erikthered.com/mathle/
Mathler (hidden calculation)
https://www.mathler.com/
Numberle (hidden equation – multiple games by this name)
https://numbrle.com/
https://numberle.org/?challenge=NCo4Kzk9NDE
Numble (hidden equation – multiple games by this name)
https://www.thenumble.app/
https://numble.game/
Primel (guess the 5-digit prime number – multiple games by this name)
https://cojofra.github.io/primel/
https://converged.yt/primel/
Geography
WorLdle (guess the country)
https://worldle.teuteuf.fr/
Music
Heardle (guess the song)
https://www.heardle.app/
BTS Wordle (words related to superstar group BTS – ARMYs unite!)
https://bts-wordle.vercel.app/
BTS Heardle (if Heardle were only BTS songs)
https://www.bts-heardle.app/
Taylordle (words related to Taylor Swift – your turn, Swifties!)
https://www.taylordle.com/
Swiftle (if Heardle were only Taylor Swift songs)
https://www.techyonic.co/swiftle
Videogame Heardle (guess the videogame song)
https://videogame-heardle.glitch.me/
Movies/Film
Box Office Game (guess the movie based on given US weekend box office)
https://boxofficega.me/
Framed (guess the movie)
https://framed.wtf/
Moviedle (guess the movie)
https://www.moviedle.app/
SWordle (takes place in a galaxy far, far away)
https://wordle.starwars.guide/
Pokémon
Squirdle – version 1 (guess the Pokémon)
https://squirdle.fireblend.com/daily.html
Squirdle – version 2 (guess the Pokémon team)
https://grevory.github.io/squirdle/
Sqwordle (guess the Pokémon)
https://www.sqwordle.io/
Other
Birdle (guess the bird)
https://quuxplusone.github.io/wordle-clone/birdle/
Cloudle (guess the 5-day weather forecast for a given city)
https://cogit.fun/cloudle
Dungleon (guess the dungeon’s composition)
https://www.dungleon.com/
Learnle (general knowledge)
https://learnle.net/
Marvle (guess the Marvel word – may not just be movies)
https://ymfyw.github.io/Marvel-Wordle/
Mickeyrdle (“mouse”-inspired, including related to the theme parks or any of the extensive properties they own. If you figure out how to pronounce this, let me know.)
https://mickeyvisit.com/disney-wordle/
Passwordle (Can you brute force a password? Good luck!)
https://passwordle.com/
Poeltl (NBA player guessing game – name derived from play Jakob Poeltl)
https://poeltl.dunk.town/
Redactle (guess multiple words to uncover a random Wikipedia article)
https://www.redactle.com/#
Subwaydle (NYC subway connections)
https://www.subwaydle.com/
See Also
Wordleverse
There is a crazy catalogue of Wordle-type games at https://wordleverse.net/games, which has many of these, plus a ton I was not even aware of – including joke ones, like Grootle. (Rather than copy their content, I’ll direct you over there if this isn’t enough for you.)