docs: add Hex and AI tools section in ecosystem page

site/ecosystem.md

@@ -82,6 +82,7 @@ We mark featured plugins and tools with a <span class="octicon octicon-star"></s
 - [Liminoid](https://liminoid.io/), toolkit for building interactive analytics applications with Python and WebAssembly. Can pass Python data to JavaScript callbacks which render Vega/Vega-Lite specifications.
 - [Neptune.ai](https://neptune.ai), machine learning experiment tracking tool with Vega-Lite and Altair visualizations.
 - [Livebook](https://github.com/elixir-nx/livebook), Interactive and collaborative code notebooks with Vega-Lite visualizations.
+- [Hex](https://hex.tech) is a data science platform that uses Vega-Lite visualizations.
 
 ## Tools that use Vega-Lite
 
@@ -125,3 +126,7 @@ We mark featured plugins and tools with a <span class="octicon octicon-star"></s
 - [generator-veeg](https://github.com/millette/generator-veeg) is a Vega and Vega-Lite boilerplate generator for [Yeoman](https://yeoman.io/).
 - [Kroki](https://kroki.io/) is a service to render Vega and Vega-Lite as PNG, SVG, or PDF.
 - [vega_embed_flutter](https://pub.dev/packages/vega_embed_flutter), a flutter-web widget to embed Vega-Lite specs into flutter-web apps.
+
+## AI Tools
+
+- [CodeParrotAI](https://codeparrot.ai/oracle?owner=vega&repo=vega-lite), an LLM with RAG for answering questions about Vega-Lite.