does anyone know anything about these woods.

There are hundreds of species of Eucalypts and Red Gum is just one of them. There are also many species of Acacia and IIRC Koa is one that is indigenous to Hawaii, and favoured by guitar makers. (Koa is Acacia Koa) Tasmanian Myrtle is also called Beech, Myrtle Beech and Australian Cherry. Mango is a fruit tree. Not really a commercial timber here in Australia but i've heard of it being used by woodcarvers and vaguely recall having heard of Mango wood canoes, possibly in India??

Do a Google search for Australian Hardwoods and you'll hit most your list.

Here's a few links- Eucalyptus -