Creating AI-generated videos from text is possible using several platforms that utilize advanced AI to convert scripts into videos, often with avatars, animations, and voiceovers. Here are some free or freemium tools you can use:

AI Tools for Text-to-Video
1. Synthesia
2. Pictory
3. DeepBrain AI

Steps to Create Text-to-Video Using Open-Source Tools

Write Your Script: Prepare the text content to include in your video.
Add Visuals:
Use OpenShot or Kdenlive for a simple timeline-based editor.
Use Manim for dynamic text animations.
Add Text Overlays:
Use tools like FFmpeg to add text overlays programmatically.
Animate and Export:
Use Blender or Manim for advanced animations.
Export the video in your desired format.