Let me help you understand the current landscape of AI video generators. As of early 2024, here are some accessible options:

1. Runway (www.runway.ml) - Offers a free trial with limited features
- Good for short video clips and simple edits
- Text-to-video generation
- Video styling and effects

2. Kapwing - Free tier available
- Online video editor with AI features
- Good for basic video creation and editing
- Some templates available in free version

3. InVideo - Has a free plan
- AI-powered video templates
- Text-to-video functionality
- Limited exports in free version

4. HeyGen - Limited free trial
- Specializes in AI avatar videos
- Good for creating talking head videos
- Text-to-speech features

Important considerations:
- Free versions typically have limitations like watermarks, export restrictions, or limited processing time
- Quality may be lower compared to paid versions
- Most require account creation
- Output resolution and length are often restricted in free tiers