While this is a very detailed post, which is awesome, pleeeeeease do not recommend projects that have not been updated in years, or have specifically stated they are discontinued. Quite a few of your links are of this type.
You open the pages, and you look at the dates in the files to see when they've been updated last. In some of them, the explanation will say on the page that the project is discontinued, so you don't even have to do that.
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While this is a very detailed post, which is awesome, pleeeeeease do not recommend projects that have not been updated in years, or have specifically stated they are discontinued. Quite a few of your links are of this type.
You're right. Probably some of the repositories should not have been mentioned.
Because someone can fork the project and continue
That isn't why they posted them. Now, if it was called "18 amazing repos that you can fork and continue improving", that would be different.
How do you identify this repos
You open the pages, and you look at the dates in the files to see when they've been updated last. In some of them, the explanation will say on the page that the project is discontinued, so you don't even have to do that.