All but the last two appear to be your native Australian dendrobiums. Photos 1 - 3, 7 and 8 look to me like Den. x delicatum (a natural hybrid of speciosum and kingianum), while 4, 5 and 6 look like they might be Den. gracilicaule (or maybe a hybrid derived from that species). Even if you're never able to identify them with absolute certainty, knowing that they're Australian dendrobiums should help you care for them. And if you can find a local orchid club you're bound to find some members who would be of potentially greater help than any of us who observe your plants long distance. Good luck!
Steve
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