Is it possible to relate a list between 2 different boards?

[Daniela Dias]

Is it possible to relate a list between 2 different boards?

That is, having a list on my private board and making it available to another user who is not included in the initial board?

[Dan]

Depends how integrated you want the lists to be. Do you want them to have information flow both ways? that is if you make a change to a card then the same change is made to the other board, and if they make a change to a card the same change is made to your list? If so the only real option is to use a paid power up like Unito. That said your boards still need to be in the same workspace I believe. 

If you just want the other person to see the cards you create you can create a rule like: 

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when a card is created in list "Your List", create a new card with title "{triggercardname}" in list "Their List" on board "Their Board"

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Hope this helps