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Tool
Category
Pricing
Free?
Updated
XAgent
AI Agents
Free
✓
Mar 2026
→
Open-source autonomous agent with hierarchical planning and sub-agent coordination
Best for: autonomous
Zapier AI Agents
AI Agents
Freemium
✓
Mar 2026
→
Autonomous AI agents on Zapier with access to 6,000+ app integrations
Best for: Zapier
Semantic Kernel
AI Agents
Free
✓
Mar 2026
→
Microsoft SDK for building AI agents with plugins and memory
Best for: semantic-kernel