Currently JVZoo has set up an integration with GoToWebinar. However, you can use other webinar software in the product editor. You'll need to write, or have written for you, the integration script. Not all third party softwares work with JVZoo so you will want to contact the provider to ensure that your integration will work.
To learn more about webinar setup and integration you can refer to the tutorial video in this article here: https://jvzoo.zendesk.com/hc/en-us/articles/221620008-Setting-Up-Webinars-With-JVZoo