Hello, I've been compiling a list myself. Guess I'll share :)
blitztactics.com/ You can drill tactics and puzzles here, they also have a leader-board if you are super competitive.
wtharvey.com/prodex.html 30,000 chess puzzles taken from the games of grandmasters, I actually took some of them for my "Puzzle Pack" studies. Feel free to check them out :)
chessbook.com/ You can create and drill your personal opening repertoire. I think you can also connect your lichess account. I haven't tried so I don't know what it does, but I assume it will be rather beneficial.
nextlevelchess.blog/free-ebook/ I know GM Noel Studer is offering a free ebook. I have not got it, so I can't vouch for it or it's contents. Probably a good read though (if you like ebooks...)
youropeningstats.onrender.com/ Opening stats, how well you do in your openings.
www.openingtree.com/ I think this does something similar to the above link ^
tailuge.github.io/chess-o-tron/html/blunder-bomb.html?p=P I know, the link looks sus. I found this website here lichess.org/faq#sites_based_on_Lichess Basically, you press 'space' to scroll through the moves, and if you spot the blunder, you press the "Blunder" button.
listudy.org/en
aimchess.com
papachess.com/
chesslab.me/
www.chessfactor.com/
www.chessable.com/
blitztactics.com/ You can drill tactics and puzzles here, they also have a leader-board if you are super competitive.
wtharvey.com/prodex.html 30,000 chess puzzles taken from the games of grandmasters, I actually took some of them for my "Puzzle Pack" studies. Feel free to check them out :)
chessbook.com/ You can create and drill your personal opening repertoire. I think you can also connect your lichess account. I haven't tried so I don't know what it does, but I assume it will be rather beneficial.
nextlevelchess.blog/free-ebook/ I know GM Noel Studer is offering a free ebook. I have not got it, so I can't vouch for it or it's contents. Probably a good read though (if you like ebooks...)
youropeningstats.onrender.com/ Opening stats, how well you do in your openings.
www.openingtree.com/ I think this does something similar to the above link ^
tailuge.github.io/chess-o-tron/html/blunder-bomb.html?p=P I know, the link looks sus. I found this website here lichess.org/faq#sites_based_on_Lichess Basically, you press 'space' to scroll through the moves, and if you spot the blunder, you press the "Blunder" button.
listudy.org/en
aimchess.com
papachess.com/
chesslab.me/
www.chessfactor.com/
www.chessable.com/