Someone who knows a lot more than I do will be needed to get down to the species level. But I would suspect that the first one is a Maxillaria, the second a Pleurothallid of some sort, I'm not going to even guess the genus, and the last two a Lepanthes., Those are pretty big targets - all are very large genera. The flower of the first (largest) one, do look a lot like Eria or Dendrobium, but those are Asian genera. Maxillaria is a New World genus which is why I strongly suspect that's what it its.
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