Some of the best free web conferencing software available are:
1. Zoom: Zoom is the best free web conferencing software for video and audio conferencing, webinars, and group collaboration. It allows you to host up to 100 participants and provide them with a range of features such as whiteboarding, file sharing, recording, and more.
2. Skype: Skype is a free web conferencing software that allows you to do voice and video calls as well as instant messaging. It allows you to add up to 25 participants in a group call.
3. GoToMeeting: GoToMeeting is a free web conferencing software that allows you to host online meetings and webinars with up to 25 participants. It includes features such as group chat, file sharing, and screen sharing.
4. Google Hangouts: Google Hangouts is a free web conferencing software that allows you to host video calls and meetings with up to 25 participants. It also comes with features such as screen sharing, text chat, and file sharing.
5. WebEx: WebEx is a free web conferencing software that allows you to host meetings, webinars, and training sessions with up to 25 participants. It includes features such as file sharing, screen sharing, audio and video recording, and more.