For what it’s worth (since you can’t display folder labels in Stacks) the icons I use to distinguish are the ‘Angellist’ which is a peace sign (i.e. Two fingers) for Foundry 2 and then either a Gavel (sort of looks like the Foundry hammer) or the Foursquare logo (an F) for F3.
Ha! I like it. I currently use wrenches, since there wasn’t a proper hammer in the options. But gavel is pretty close. I color one orange for Foundry 2 (that was the color of the older icon) and purple for Foundry 3, since the Foundry 3 Control Center is purple.
Several tools have not come over from the addon packs. One that people have asked about that is not included in Foundry 3, and is mentioned in the forum FAQ, is Motion. If you’re inquiring about specific tools you can create a new post on that topic, or shoot me a direct message with the inquiry and I’d also be glad to help out. But I’m going to close this thread since we’ve veered off of the original topic.