1. Notion AI: Notion's AI integration enhances its already powerful productivity and organization capabilities. It can assist with task management, note-taking, and document creation.

2. Motion: An AI-powered productivity tool that combines calendar management, project timelines, and task lists. It uses AI to help optimize scheduling and task management.

3. Zapier: Zapier's AI Copilot can help create automated workflows (Zaps) using natural language. It also offers AI by Zapier, which integrates GPT capabilities into workflows without needing a separate API key.

4. Clockwise: An AI-powered calendar tool that optimizes schedules and promises to save users one hour per week.

5. Todoist AI Assistant: Helps break down tasks, make them more actionable, and provides tips for task completion.

6. Otter.ai: An AI-powered transcription and note-taking tool that integrates with video conferencing platforms like Zoom and Google Meet.

7. Reclaim AI: Offers smart scheduling features, including a meeting scheduler and daily planner.

8. Pieces for Developers: A comprehensive developer toolset that includes ChatGPT integration for various coding tasks.

9. SeekWell: Allows users to query and synchronize data between tools using plain SQL, with ChatGPT integration to help write SQL commands.

10. Perplexity AI: A search engine and research assistant that uses AI to provide comprehensive answers and information.

These tools leverage ChatGPT or similar AI technologies to enhance productivity in various ways, from task management and scheduling to content creation and data analysis. The specific features and integration methods may vary between tools, so it's worth exploring each one to find the best fit for your workflow and needs.