I guess the main ones on the Australian market are:
NovoPen 4 (Cartridges) *not available in Aus*
NovoPen 3 (Cartridges)
Humapen Luxura (Cartridges) & Humapen Memoir (Cartridges with Memory)
Solostar (Prefill Lantus & Apidra)
Flexpen (Novo Nordisk prefill insulins)
KwikPen (Humalog prefill)
These are the ones that i currently know of. Of course there will be more!