We can't talk about free video conferencing tools without mentioning Skype. It is a well-known veteran in this space, used for years by millions of people.
Skype is one of the veterans of video conferencing, being around for almost 20 years now. It's a great free tool for real-time interviewing and allows you to create a meeting online without even needing to make an account or download their app.
While Skype is definitely convenient, it doesn't have any of the key features that make a solution ideal for recruiting. But it's a good alternative if your company is still deciding on a different solution.
All you need is an account, and you can simply access Skype from your browser. They have computer and mobile apps as well.
Skype is owned by Microsoft, meaning easy integration with any Microsoft product.