I don't know about the others, but Zotero automatically informs me of retractions for articles in my database: https://www.zotero.org/blog/retracted-item-notifi

I don't know about the others, but Zotero automatically informs me of retractions for articles in my database: https://www.zotero.org/blog/retracted-item-notifications/ https://www.zotero.org/blog/retracted-item-notifications/ So, if a previous article is retracted when I write my own article, I'd probably know.