There is one site that indicates that the plants listed below get along with Eucalypts, but most info says that the Eucalypts mainly get along with each other.

Foxglove, Guava, Jobes Tears, Magnolia, Marsh Fleabane, Matilija Poppy, Orange, Papaya, Periwinkle, Pitcher Sage, Prickly Poppy, Rosemary, Tobacco, Tronadora, Turkey Mullein, White Sage, Yerba Reuma

But, since Eucalypts are native to Australia, you might want to go to the Australian GardenWeb site (below) and ask there. No place deals with Eucalypts better than the Aussies.

Sue

Here is a link that might be useful: GardenWeb Australia