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Advice me some good free open-source chess websites like Lichess

Advice me some good free open-source websites like Lichess. The sites that can help me advance my poor chess skills. And please, without any payment options. Free as in Lichess.

Besides Lichess I know only Blitz Tactics. What are other sites?
Do you want to increase your playing strength ir learn something about chess programming? Is open-source that important?
Blitz tactics i no like a lot, i prefer chesstempo and ideachess.
While if u are searching for free sites like lichess,i am sry but i no know them(i know chess.com and chess24.com but for some "extra options" u must pay.).
Thanks for the answers. I mean "open-source" in the sense of the being free completely. That's why Chesstempo doesn't look like it -- it has paid features (and these are very limiting). The same goes to chess.com -- paid features.

I'd like to find websites that are completely free just like Lichess. No paid features -- it's important for the person from the poor Ukraine (that's me).

Thanks for the mentions of LucasChess and Chess Hero. Yeah, I know about them and use them. Advice me some more please.
You want a chess site like lichess. What's wrong with lichess - or what feature do you miss? I doubt that there is any other website that offers the same quality content as lichess for no money
You can take a look at some Youtube-Channels. Some are really good.
@dmytron;

Yes, I know. I gave you these three links because you can use free features even if they are no-free services.

Chesstempo is a specialized -in my opinion, the best- webpage destinated in chess tactics, and, sadly, it is not free.

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