The best Web Conferencing alternative to 3CX is Thirdlane Connect. It's not free, so if you're looking for a free alternative, you could try Spreed. If that doesn't suit you, our users have ranked more than 25 alternatives to 3CX and three of them are Web Conferencing Tools so hopefully you can find a suitable replacement.
Thirdlane Connect is a versatile collaboration tool that combines messaging, voice, video, and app integration into a cohesive and efficient experience on any platform.
Thirdlane® Business Phone System stands as an advanced IP PBX and Unified Communications solution, designed for both on-premises and cloud deployment.
Spreed is the worldwide unified web conferencing service offering integrated web and telephone conferencing. It is based on Flash Player. Free service includes 3 attendees and max 1.5h meetings. Single events or monthly service can be purchased.
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Feature rich application and great support