In Cartes du Ceil if you right click on a object near the RA/Dec in which you are interested, and choose the "About objectname", the window that pops up has a "Neighbour" button. Read the help to choose what is to appear in the list. You can decide what type of object and the limiting magnitude.
I just tried it on M31 and with the default settings the list included M34, NGC224, NGC1039, 8 variable stars, 8 variable stars, and 8 stars in the BSC.
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