ooVoo is a free video chat and messaging application that allows users to connect through video calls, voice calls, and instant messaging. Originally launched in 2007, it became known for its ability to support group video chats with multiple participants, making it a popular choice for both personal and professional communication. The service is accessible via desktop and mobile platforms, offering cross-platform capabilities. As of my last update, it's important to verify the current status of ooVoo, as it has undergone changes and updates over time.