Business meetings/ Exhibitions (actual/online) & Company representatives

I have a website that I'm building right now, that contains a service for online exhibitions (Audio/Video/Text) and online meetings for business men, in addition to other similar services like company representative, which allow company representative to speak with customers (business/final customers) with text or with voice/video if they want! also the services of actual business meetings and exhibitions. (can be made in one app, and used in 2 places) I'm looking to have apps that can be used for the things above, and each one of these have special technical features check file for details