Add Air and ThinkRail to Code Editors and Assistants

[CommanderTvis]

🚀 Summary

Adds two AI-native development environments to the end of the Code Editors and Assistants section:

• Air – JetBrains' agentic development environment. JetBrains discontinued Fleet as a standalone product on December 22, 2025 and pivoted its technology and team into Air, so this is the current home of that line of work.
• ThinkRail – open-source worktree IDE for the Pi coding agent (introduction post).

✅ Checklist

• I have read the contribution guidelines
• The tool is AI-related and useful for developers
• I have added a short, clear description of the tool
• The link is not a duplicate of an existing one
• The title of the link is properly capitalized
• The link follows the Awesome List format (- [Tool Name](link) – description)
• My change does not include unrelated files or changes

📌 Why is this tool awesome?

Air is the successor to Fleet from JetBrains, so readers looking for Fleet or for a JetBrains-built agentic environment currently find nothing in this list.

ThinkRail covers a niche the list does not yet represent: it turns any git repo into isolated git worktree workspaces so multiple agent sessions run in parallel without polluting the main branch, and it treats project documentation as a linked graph of SPEC.md files the agent maintains. It is open-source and BYOK, which fits the free-tier requirement in the guidelines.

🔗 Link

• https://air.dev/
• https://thinkrail.ai/ (source: https://github.com/JetBrains/thinkrail)

📝 Additional context

Both entries are appended to the end of the relevant section per the contribution rules. No other files or sections are touched.

🤖 Generated with Claude Code