Looking for a group conference call system where 10 people can ask questions to the presenter in an orderly way

from the conference calls I've been involved in there has been a chat box to the side of the presentation and when the conference gets to the Q/A section the moderator then asks the question of the presenter.

Used Microsoft Skype with 3-30 people to share the moderators desktop. We were not allowed to attach a microphone to the PC, so we called into a conference call phone number. On the left side of the desktop display is a chat box. Many times I didn't know who of the 30 people were talking because several voices sounded alike and I mentioned that, but moderators never required a new person talking to start with "John here". But the chat box allowed for private side bar conversations (and we knew who was chatting - good). We could provide web links to the entire group when someone expressed a need for some information. Although there wasn't a formal raise hand button, a convention could have been made by using an emoji, such as a happy face or other emoji's provided by Skype.

So, although our approach was a little chaotic, that really didn't have to do with Skype, but rather not following any conference meeting civil conventions. A meeting of 10 people around a table can be just as chaotic without a moderator setting the rules so that one person speaks at a time.