Alternatives / GitHub Copilot
Looking for an open source GitHub Copilot alternative? We compared 6 open source AI coding editors, agents, and assistants by license, models, self-hosting, and editor support. They range from a full AI-enabled editor to agents for VS Code and the terminal and a self-hosted completion server.
Written by Maxime DERAME
Last updated:
| Alternative | Best for | License |
|---|---|---|
| Zed | Fast AI-enabled code editor | GPL-3.0-or-later with Apache-2.0 components |
| Cline | Autonomous coding agent in VS Code | Apache-2.0 |
| Aider | Terminal pair programming (slower development) | Apache-2.0 |
| Kilo | Agent for VS Code, JetBrains, and the CLI | MIT |
| Tabby | Self-hosted code completion (open core) | Open-source core + separate Enterprise (ee) license |
| Forgecode | Terminal agent inside ZSH | Apache-2.0 |
We looked for open-source tools that overlap with Copilot's core: AI code completion, chat, and agents that edit code in your editor or terminal. We verified each project's license, recent activity, stars, and editor support in its repository. Copilot is a hosted subscription tied to GitHub, so we separate tools that bring their own models from a self-hosted completion server, and flag open-core and slower projects. See our methodology for the full criteria.
Cline, Aider, Kilo, and Forgecode connect to model providers with your own API keys or local models, so costs depend on the provider you choose. Tabby runs models on your own server, which needs suitable hardware. Zed offers its own hosted AI service as well as bring-your-own-key.
Cline and Kilo are the closest in everyday use: agents inside VS Code that read your project, edit multiple files, and run commands, and Kilo also supports JetBrains and the CLI. Tabby is the closest to Copilot's classic completions as a self-hosted server. Zed is a full editor with AI features, rather than a plugin for your existing editor.
Aider is a terminal tool for AI pair programming that edits your repository and commits changes, working with models such as Claude, GPT, and DeepSeek. Forgecode is a terminal-native agent that runs inside ZSH with a multi-agent architecture. Both suit developers who prefer the command line to an IDE.
Cline, Aider, and Forgecode are Apache-2.0, and Kilo is MIT. Zed is primarily GPL-3.0-or-later with Apache-2.0 components. Tabby has an open-source core, but its ee directory is under a separate Enterprise license.
Zed, Cline, Kilo, and Forgecode were updated within days of this update. Aider's last release was in August 2025 and its last commit in May 2026, and Tabby's last release was in January 2026, so both are slower.
GitHub Copilot is a proprietary subscription from Microsoft and GitHub: your code context is sent to its cloud, usage is limited by plan, and you cannot choose arbitrary models freely. Open-source alternatives let you use any model provider or local models, keep code on your own infrastructure, and avoid per-seat pricing, at the cost of managing API keys, model costs, and setup.
Zed is a high-performance editor combining native editing, Git, debugging, language-server support, collaboration, remote development, and multiple AI providers.
Pricing: Open-source editor; hosted AI usage may be paid and provider costs may apply.
Apache-2.0 coding agent for VS Code and command line. It can read and edit files, execute terminal commands, use browsers, run tests, and perform multi-step tasks with a choice of model providers or local models. Includes Plan/Act workflows, MCP, custom rules, and CI/CD usage.
Pricing: Open-source client; model API usage is separate.
Apache-2.0 terminal pair-programming tool that works in existing Git repositories. Coordinates multi-file edits, integrates changes with Git, and can run lint and test commands. Supports many model providers, repository maps, editor-independent workflows, and voice input.
Pricing: Open-source client; model API usage is separate.
Self-hosted coding assistant focused on code completion and private inference infrastructure. Offers repository context and editor integrations. Main code outside the Enterprise directory is Apache-2.0; functionality under ee/ has separate commercial licensing.
Pricing: Open-source core with separately licensed Enterprise functionality.
MIT agentic coding platform for VS Code, JetBrains IDEs, and the command line. Supports more than 500 model options, bring-your-own API keys, local models, coding, debugging, planning, and codebase Q&A modes, an MCP marketplace, autonomous CI/CD, and mid-task model switching.
Pricing: Open-source tooling; model API usage and optional cloud features are separate.
Apache-2.0 terminal coding harness using specialized agents for development tasks and aiming to minimize unnecessary model context. Supports model selection for planning, coding, and analysis, skills, and a broad set of LLM providers.
Pricing: Open-source harness; model provider costs are separate.
| Alternative | Type | License | Self-hosted | Best for |
|---|---|---|---|---|
| Zed | AI code editor | GPL-3.0-or-later + Apache-2.0 | Local app | A fast editor with AI |
| Cline | VS Code agent | Apache-2.0 | Local extension | Multi-file agent edits |
| Aider | Terminal agent | Apache-2.0 | Local CLI | Git-based pair programming |
| Kilo | Agent for VS Code, JetBrains, CLI | MIT | Local extension | Multiple modes and models |
| Tabby | Completion server | Open core + ee license | Yes | Private code completion |
| Forgecode | ZSH terminal agent | Apache-2.0 | Local CLI | Terminal-first developers |
Want an AI-enabled editor, not a plugin
Zed is a fast Rust editor with real-time collaboration, Git support, and AI features, licensed primarily under GPL-3.0-or-later.
Want an autonomous agent in VS Code
Cline edits multiple files and runs terminal commands with any model provider, under Apache-2.0.
Want an agent for VS Code, JetBrains, and the CLI
Kilo supports several IDEs and modes with hundreds of models, under MIT.
Want self-hosted code completion
Tabby runs completions on your own server with a privacy focus, but its enterprise features use a separate license.
Prefer the terminal
Aider edits your repository from the terminal with Git integration, though its development has slowed.
Use ZSH and want a multi-agent terminal tool
Forgecode runs inside ZSH and mixes models per task, but it is specific to that shell.