Alternatives to Github Copilot Rules

Open-source SKILL.md rules that stop AI coding agents shipping generic frontend UI

Free open-source design-intelligence skill that feeds UI styles, palettes, fonts, and chart rules into Claude Code, Cursor, and other AI coding assistants.

Free open-source JetBrains AI code assistant with agentic coding, spec-driven development and local LLM support

ReadMe turns an OpenAPI spec into interactive API docs with AI linting, Git-synced review branches, and an MCP server agents can query.

Copilot for Xcode puts GitHub Copilot, Codeium and ChatGPT suggestions, chat and code edits inside Apple's Xcode editor.

OpenSpec is a spec-driven development framework that keeps AI coding agents building the right thing — and proves it.

Spec-driven development for AI coding agents: write requirements.md, design.md, and tasks.md before Claude Code, Cursor, or Copilot touch

Open-source, self-hosted AI code completion with an in-IDE answer engine, inline chat, and the Pochi agent

Open-source React framework for building a custom rich-text editor, with headless plugins, copy-in UI components and an MCP-ready AI plugin

Open-source Vue3+Gin admin framework with built-in AI assistant via MCP

Open-source skill that turns any brand into a design system Claude Code and Codex can build with

JetBrains Air is one system for building software with agents across JetBrains IDEs, the browser, CLI and mobile

Zed is a GPU-rendered Rust code editor that runs parallel AI agents at native speed

Sourcegraph Cody brings whole-codebase context to AI coding chat, completions, and agentic batch changes across hundreds of repos.

GitLab Duo Agent Platform: policy-governed AI agents that carry code changes through review, security, and CI/CD pipelines

Self-hosted code search and AI code Q&A that gives coding agents context across every repo you own

Trae is an AI coding IDE with parallel SOLO cloud agents and usage-metered pricing

ForgeCode runs your software factory: parallel AI agents that turn tickets, alerts and Slack mentions into tested PRs.

Estate-wide code transformation with deterministic recipes and a Lossless Semantic Tree for agents

ClinePass: flat $9.99/mo access to curated open-weight coding models inside the Cline agent

Terminal-first AI dev workspace: Vim editor, AI agents, Git graph, and live web preview in a 7 MB app

ADE runs Claude Code, Codex, Cursor and other AI coding agents side by side in one synced agentic development environment

Dalus is an AI-native SysML v2 model-based systems engineering platform for hardware teams, with a Copilot that drafts system models from requirements.

Windsurf is now Devin Desktop: a command center for running local and cloud coding agents from one place.

GitDiagram turns any GitHub repository into an interactive file-structure diagram or a one-minute explainer video.

CodeCompanion.nvim brings LLM chat, inline edits and CLI agents like Claude Code and Codex into Neovim buffers.

SpecStory saves your AI coding agent sessions as local Markdown so prompts, tool calls and reasoning survive the session.

FanBox is a free macOS terminal with a live diff viewer showing every file your Claude Code or Codex agent writes.

Kratos is the Go microservices framework for Protobuf-first APIs spanning HTTP and gRPC, plus Blades for AI agents.

Silimate deploys fast AI agents for frontend chip design, converging PPA and root-causing RTL bugs in days.