There are several websites that offer free AI video services, some of the popular ones are:

Animoto: This is a cloud-based video creation tool that uses AI to help you create professional-looking videos. It offers a free version with basic features.

Magisto: This website uses AI to create short video clips that can be used for marketing or personal purposes. It offers a free version with limited features.

Kapwing: Kapwing is an online video creation platform that offers free AI video editing tools. You can add text, images, music, and effects to your videos with just a few clicks.

Flexclip: This is a free online video maker that uses AI technology to help you create engaging videos. You can use Flexclip to create videos for various purposes, such as marketing, education, or entertainment.

WeVideo: This website offers free AI video editing tools that can be used to create professional-looking videos. You can choose from a wide range of templates, themes, and special effects to enhance your video.

Keep in mind that while these websites offer free services, they may have limitations on features, storage space, and video length. You may need to upgrade to a paid plan if you require more advanced features.