ChatGPT MCP and Apps: extensions you can try

RemCTL 2.0 is a free, open-source Apple Reminders power UI and MCP extension built with Codex that lets you use Reminders as a pro tool inside ChatGPT.

The open-source ritmo repo helps developers package MCP-powered apps for ChatGPT submission quickly, and can be handed to a coding agent.

A comment argues consumer AI products fight a three-front war, with Sign In With ChatGPT covering capacity and token cost and plugin extensions covering distribution.

Sites can now run MCP servers and turn them into ChatGPT plugins for web, mobile and desktop, though hosting is still beta and usage limits remain unclear.

An opinion post says Sites can host MCP servers and package them as plugins, as ChatGPT shifts from a chat window to a place where you ship tools.

A breakdown of how ChatGPT Sites hosts MCP servers, covering D1 and R2 storage, plugin sharing scopes, and the lack of TCP, private networking and data residency.

MCP tools can be built inside a ChatGPT site and published as a plugin that works on web, mobile and desktop without a separately managed server.

OpenAI released mcp-extensions under Apache 2.0, letting MCP apps become real ChatGPT surfaces such as sidebar apps, file viewers and rich forms; it drew about 560 stars in two days.

Rustler released an MCP server that lets AI assistants search Rust jobs, repositories, issues, events and the newsletter directly from Claude, ChatGPT, Cursor or any MCP-compatible client.

Altman says Sign In With ChatGPT and Plugin Extensions hold far more potential than is currently recognized, calling them a key direction for OpenAI ecosystem distribution.

Steve Moser explains in a video that plugins can contain multiple apps, while the newly announced plugin extensions are built on MCP and can appear in the sidebar, conversation panels and Composer.

A developer demos ChatGPT's new plugin and MCP features with a scheduled-post preview, but says integration takes a lot of work and asks whether a standalone UI or landing page is still needed.