Good tile editor for a Zeldaeqsue game?

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octothorpe

I'm looking for a good tile editor for a Zeldaeqsue game. I'd prefer something free.

I'm thinking a really useful feature would be to be able to specify rules for how transitional tiles are laid out. (I'd like to be able to paint a single grass tile in a sea and have the surrounding tiles automatically turn into shore tiles according to rules I've set, instead of having to paint them individually.)

I'd also like to be able to position my objects (monsters/keys/doors/chests) on top of the map so I can see how things will look.

Thanks in advance for your suggestions!