OpenMeetings vs WebEx

Openmeetings is free video conferencing software that allows you to chat via video, to do whiteboarding, to convert documents on the fly, etc. It even allows you to share your desktop.
Web conferencing lets you connect with anyone, anywhere, in real time. WebEx combines desktop sharing through a web browser with phone conferencing and video, so everyone sees the same thing while you talk. WebEx free alternatives are Skype, Google Hangouts. If you are looking for open-source self-hosted WebEx alternatives pay attention to Jitsi and Rocket.Chat.