Is there a website that shows which ILC camera lenses extend when they are zoomed and which do not?

I have not seen any web site. Only lenses I know internal zoom are from m43: Panasonic 35-100mm f2.8, 45-175mm and new Oly 40-150mm f2.8.
 
There is no resource I know of. You may have some luck if you narrow down your search. I was able to find a list (not comprehensive by any means) of Pentax lenses that extend and those that do not. Perhaps if you search internal zoom and different brands, you may have some luck. But every lens is different. Personally, I would pay a hefty premium for any lens that zooms internally. It may sound ludicrous, but I hate the way they look when you see all that smooth plastic when they zoom externally.
 
Non-extending zoom lenses are a relatively rare commodity. They are most commonly found in short telephoto zooms like various 70-200mm f2.8 and f4 lenses, both f2.8 Micro 4/3 telephoto zooms, the Olympus 12-50mm and the Panasonic 7-14mm and 45-175mm. There are also some ultra-wide angle zoom lenses which extend only fractionally or extend/retract within the lens barrel such as the Canon 16-35mm and 17-40mm.
 
There is no resource I know of. You may have some luck if you narrow down your search. I was able to find a list (not comprehensive by any means) of Pentax lenses that extend and those that do not. Perhaps if you search internal zoom and different brands, you may have some luck. But every lens is different. Personally, I would pay a hefty premium for any lens that zooms internally. It may sound ludicrous, but I hate the way they look when you see all that smooth plastic when they zoom externally.

Same here. Except I can't afford the internal zoomers. The problem with external is that it brings more instability to the shot as you continue to zoom in on something. I don't much care what they look like, but I hate barrel shake.
 
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