✓
Tool
Category
Pricing
Free?
Updated
Semantic Kernel
AI Agents
Free
✓
Mar 2026
→
Microsoft SDK for building AI agents with plugins and memory
Best for: semantic-kernel
Obsidian ✓
AI Productivity
Freemium
✓
Mar 2026
→
Local-first knowledge base with AI plugins for second brain building
Best for: note-taking
AskYourPDF
AI Research
Freemium
✓
Mar 2026
→
AI PDF assistant with ChatGPT plugin integration and batch document processing.
Best for: PDF
Kestra
AI Automation
Freemium
✓
Mar 2026
→
Open-source YAML-based declarative workflow orchestration with event-driven architecture.
Best for: orchestration