ToME: the Tales of Maj'Eyal

When using a ranged spell, the range preview overlay takes invisible enemies into account, making it possible to infer their position.
All the same, the autoexploring stops when next to an invisible enemy with enemy in sight even though you should not yet have been able to detect it.
Beta 37

Also, you can inspect creatures that you can not ever see, by selecting the tile they are on.

Also, Hymn of Moonlight shoots them, letting you work out where they are. Not sure if this is a bug. It is VERY helpful though