Jan's list is the good one, but Stardock Central is missing from it. That was how Object Desktop got delivered before Impulse turned up, and it had an icon of its own.
The delivery clients are the hard part of a project like this. Nobody keeps the installer for a storefront that has been shut down, so those icons go first, and they were the ones people actually looked at every day. Something that shipped once and sat in a folder is easier to recover than the thing you opened every week to see what was new.
The version question worries me more than the missing entries. One icon per product is going to be wrong somewhere. My dock has not worn the same face the whole time I have had it, and I doubt ObjectBar did either. Better to leave a slot marked "later version" than to pick one and get corrected.