I don't post many images and where I leave credits for the artists is leaving feedback after a purchase and I've used the product. As far as the equipment use I have to say I think that could be a valid question at times, but then the gallery usually has a title like "Poser" or "Bryce" gallery . I use Lightwave to model my personally made poser content. The render would be Poser 6 or 7 unless I post in the Daz gallery and then I'm using Daz Studio or Bryce or even Carrara whatever version is current. Other than that I use Photo Shop or Paintshop Pro for textures and postwork. Thing about viewing images is you never know where the render is and the postwork begins unless they specify no postwork. Now come to think  about  it you're asking  this in a Poser forum. Either Poser or Vue most likely. I don't own Vue myself. I guess all that is required is that a program be used someplace in the construction of an image to qualify the image to be in a specific gallery. That's more about technique than programs I think. It doesn't make a lot of difference. I can "usually" see poser content was used though anyways.