Vinca minor. Iberis sempervirens. Ajuga. Helianthemum.. Many others when grown hard, but if well fed the leaves are juicy then just like to us they are good to eat for Slugs and Snails.

They don't go for Alliums, or Sedum, Asters, Bergenias, Corydalis, Snowdrops, Geranium macrorrhizum, Pulmonaria, Rudbeckia, Aconitum, Artemisia,Campanula, Epimedium. Some Hellebores, as well, but they might nibble low-growing early flowerbuds from them. H. foetida is safe. Try some hard-textured or hairy leaved plants, too, like Stachys byzantinus.