The Open-Source Microsoft Copilot Alternative: A Three-Lane Map

"Microsoft Copilot alternative" is an ambiguous search, because Microsoft ships at least three unrelated products under the Copilot name. GitHub Copilot is a coding assistant that suggests and edits code inside an IDE (github.com/features/copilot). Microsoft Copilot Studio is a platform for building and managing conversational agents (microsoft.com). Microsoft Copilot is the assistant integrated into Word, Excel, PowerPoint, Outlook, and Teams, and Copilot Cowork is the agentic system that carries out multi-step work across those apps (microsoft.com). They share a brand and almost nothing else.

That ambiguity is why most "Copilot alternative" lists are hard to use. A list that mixes an IDE autocomplete plugin with an enterprise agent platform answers no real question, because the products are not substitutes for one another. This page splits the category into the three lanes Microsoft actually competes in, and gives one open-source alternative table per lane. Every license, self-hosting, and model claim below was read from the project's own live site or repository on 27 September 2026, and the source URL is linked in the cell.

The three lanes, defined

Lane 1 - Coding assistant. This is GitHub Copilot, a closed-source assistant that completes and edits code in your editor, terminal, and on GitHub (github.com/features/copilot). You are choosing a tool for one developer at a time.

Lane 2 - Agent builder. This is Microsoft Copilot Studio, described by Microsoft as "an end-to-end conversational AI platform that empowers you to create agents using natural language or a graphical interface" (microsoft.com). You are choosing a framework or studio to design and publish agents.

Lane 3 - Agent management at org scale. This is Microsoft Copilot and Copilot Cowork, where Copilot Cowork "plans the steps, picks the right skills and apps, pauses for your approval at key checkpoints, and returns finished artifacts" across Microsoft 365 (microsoft.com). You are choosing the system that runs a workforce of agents and governs what they do.

The lanes do not overlap. If your actual problem is slow code completion, a lane-3 platform will not fix it; if your problem is that agents are ungoverned at company scale, a better autocomplete plugin will not fix that either. Pick your lane first, then read only that table.

Lane 1: open-source GitHub Copilot alternatives (coding assistants)

GitHub Copilot itself is proprietary and cloud-tied, sold per seat from a $0 Free tier through $10/month Pro and $39/month Enterprise plans, and it does not offer self-hosting (github.com/features/copilot). The open-source projects below replace it at the editor or terminal level. All six run locally or on infrastructure you control.

Option	License (exact)	Self-host?	Model flexibility	What it replaces
Continue	Apache-2.0 (repo license)	Yes - VS Code, JetBrains, and CLI, installed locally (repo)	Anthropic, OpenAI, Azure, Bedrock, Google Gemini, Ollama and other local runners (Continue docs)	GitHub Copilot chat and edit
Aider	Apache-2.0 (GitHub API)	Yes - terminal tool run on your machine (repo)	"Can connect to almost any LLM, including local models" (repo)	GitHub Copilot in the terminal
Cline	Apache-2.0 (GitHub API)	Yes - VS Code, JetBrains, CLI, and desktop app (repo)	Anthropic, OpenAI, Gemini, OpenRouter, Bedrock, and local Ollama/LM Studio (repo)	GitHub Copilot agent mode
Tabby	Apache-2.0 outside the ee/ directory; ee/ is under a separate enterprise license (LICENSE)	Yes - self-hosted server, "no need for a DBMS or cloud service" (repo)	Runs open code models such as StarCoder and Qwen; no external provider required (repo)	GitHub Copilot, as an on-prem server
CodeGeeX	Apache-2.0 for the repository (LICENSE); model weights released "for research purposes" (repo)	Yes - inference on your own Ascend or NVIDIA GPU (repo)	CodeGeeX 13B and CodeGeeX4 model weights you download yourself (repo)	GitHub Copilot completions
FauxPilot	MIT (GitHub API)	Yes - local server, needs an NVIDIA GPU (repo)	Salesforce CodeGen models served through Triton/FasterTransformer (repo)	GitHub Copilot server

Two caveats matter when you compare these to GitHub Copilot. First, maturity is uneven: the Continue repository states it is "no longer actively maintained and is read-only for all users," following a final 2.0.0 release (github.com/continuedev/continue), and FauxPilot's last public commit was in 2024 with "no formal support or warranty" (repo). Cline and Tabby are the most actively maintained of the six (Cline repo, Tabby repo). Second, "open source" here is not uniform: Tabby keeps its enterprise features in a separately licensed ee/ directory, so the Apache-2.0 grant does not cover the whole product (Tabby LICENSE).

Lane 2: open-source Copilot Studio alternatives (agent builders)

Microsoft Copilot Studio is closed-source, cloud-only, and priced per tenant through Copilot Credit packs of 25,000 credits at $200 per pack per month, or a pay-as-you-go meter (microsoft.com). The projects below let you build agents without that platform.

Option	License (exact)	Self-host?	Model flexibility	What it replaces
Botpress	MIT for the current botpress/botpress repo (repo); the older botpress/v12 is dual-licensed AGPLv3 + Botpress Proprietary (v12 repo)	The current product is Botpress Cloud; self-hosting is documented for v12 via Docker, binary, or source (v12 repo)	The current repo is "powered by OpenAI" (repo)	Copilot Studio conversational agents
LangGraph / LangChain	MIT (GitHub API)	Yes - it is a library you run in your own application (repo)	OpenAI, Anthropic, Azure, Gemini, Bedrock, HuggingFace, OpenRouter and more through one interface (LangChain docs)	Copilot Studio's agent orchestration
Vellum Assistant	MIT (repo)	Yes - "managed runtime on Vellum Platform, or self-hosted. Same codebase, same data model" (repo)	Anthropic, OpenAI, Gemini, OpenRouter and other providers, plus local models via Ollama (repo)	See the caveat below

Vellum needs an honest correction, because older comparison pages describe it as closed-source. As of this session, Vellum's live site states plainly that "Vellum is open-source, so you can inspect the code yourself" (vellum.ai), and its assistant repository is MIT-licensed (github.com/vellum-ai/vellum-assistant). What that live material no longer documents is an agent-builder studio equivalent to Copilot Studio; it now describes a personal AI assistant that acts across your files and tools. Treat Vellum as a lane-2 alternative only if you accept that framing, and mark its Copilot-Studio equivalence as "not documented."

LangGraph is the strongest structural match for Copilot Studio, because it is the orchestration layer rather than a hosted product: it provides durable execution, human-in-the-loop interruption, short- and long-term memory, and deployment tooling that you assemble yourself (repo). That is also its trade-off - Copilot Studio ships a graphical studio and a publishing pipeline, while LangGraph hands you primitives and expects you to build the product around them (repo).

Lane 3: open-source alternatives for Copilot and Copilot Cowork (agent management)

Copilot Cowork is Microsoft's agentic layer over Microsoft 365: it carries out tasks across Outlook, Teams, Word, Excel, and PowerPoint, pauses for approval before sensitive actions, and is billed on a usage basis (microsoft.com). It is closed and cloud-only. Two projects compete in this lane.

Option	License (exact)	Self-host?	Model flexibility	What it replaces
Kortix / Suna	Elastic License 2.0 - source-available, not OSI-approved open source (LICENSE)	Yes - self-host free on a laptop, VPS, VPC, or on-prem; managed cloud is $40/seat/month plus usage (github.com/kortix-ai/suna)	Any model provider, your own API keys (kortix.com/docs)	Copilot Cowork and ChatGPT Work, per Kortix's own positioning
OpenWork	MIT outside ee/; the ee/ control plane is under the source-available OpenWork EE License, free up to 5 users (repo)	Yes - desktop app locally, and the team control plane is self-hostable (repo)	50+ providers, your own API keys, or local models via Ollama (repo)	Claude Cowork and Codex, per OpenWork's positioning; comparable org-scale agent management

Kortix is the project this page's operator builds, so it belongs in this table with its limits stated, not hidden. Kortix calls itself "the leading open-source alternative to Claude Cowork and ChatGPT Work" and describes the product as an AI Management System: agents, shared skills, company memory, and connectors live as files in one git repository you own, sessions run in an isolated sandbox on their own branch, and work reaches the main branch only through a change request a human reviews (github.com/kortix-ai/suna, kortix.com/docs). The critical licensing fact is that the source is distributed under the Elastic License 2.0, which is source-available and not an OSI-approved open-source license (LICENSE). Anyone evaluating it "open source" should read that license, and the same caution applies to OpenWork's ee/ control plane.

OpenWork is the more conventionally open option in this lane: its desktop app and core platform are MIT-licensed, and the license converts ee/ releases to MIT two years after publication (repo). OpenWork's own comparison target is Claude Cowork and Codex rather than Microsoft Copilot (openworklabs.com), but as a system where a team shares skills, MCP servers, and a managed control plane, it is the closest open project to what Copilot Cowork does at organization scale.

How to choose: which lane are you actually in?

Answer the question that matches your problem, not the term you searched for.

• "My developers want faster completions and edits in the IDE." You are in lane 1. Try Cline or Tabby first, because both are actively maintained and both support self-hosting; use Continue only if you accept that its repository is now read-only (Cline repo, Tabby repo, Continue repo).
• "I need to build and publish conversational agents for customers or staff." You are in lane 2. Use LangGraph if you have engineering capacity and want to own the orchestration (repo); use Botpress if you want a studio and accept the OpenAI-centric, cloud-first current product (repo).
• "I need a governed workforce of agents doing multi-step work across my company's tools." You are in lane 3. Choose between Kortix, if you want agents managed as code in a git repository with Elastic-licensed source and a free self-host path (github.com/kortix-ai/suna), and OpenWork, if an MIT core and a source-available control plane fit your review (repo).
• "I mainly want a personal assistant that acts on my own files." You are not really in the Copilot replacement market. Look at Vellum Assistant (repo).

If two lanes sound true, the org-scale lane is usually the real one, because a company-wide agent system can absorb coding and agent-building as tasks while a single-plugin tool cannot grow into governance. Start where the bottleneck is, not where the keyword is.

FAQ

Is there a truly open-source Microsoft Copilot alternative? Yes, but the answer differs by lane. Coding assistants such as Cline and Tabby are Apache-2.0 (Cline, Tabby); agent-builder libraries such as LangGraph are MIT (LangGraph); OpenWork's core is MIT (OpenWork). Kortix is source-available under Elastic License 2.0, not OSI open source (LICENSE).

Can I self-host an alternative to Copilot Cowork? Yes. Both Kortix and OpenWork document self-hosting: Kortix offers a free self-host on your own laptop, VPS, VPC, or on-prem network with a managed cloud at $40/seat/month plus usage (github.com/kortix-ai/suna), and OpenWork lets you run the desktop app locally and self-host the team control plane (repo).

What is the best open-source GitHub Copilot alternative? It depends on where you work. Cline is the most actively maintained IDE-and-terminal agent with multi-provider support (repo); Tabby is the strongest fully self-hosted server replacement for on-prem teams (repo); Aider is a mature terminal pair programmer (repo). Continue is no longer actively maintained (repo).

Can I use my own models with these alternatives? In most cases yes. Cline, Aider, Continue, and OpenWork support local models through Ollama, and Kortix supports any provider with your own API keys (Cline, Aider, Continue, OpenWork, kortix.com/docs).

Is Copilot Studio the same as Copilot Cowork? No. Copilot Studio builds and publishes agents (microsoft.com); Copilot Cowork executes multi-step work across Microsoft 365 apps on your behalf and is billed on usage (microsoft.com). They are different products in different lanes and need different open-source alternatives.

Is "open source" always OSI-approved here? No. Tabby's ee/ directory, OpenWork's ee/ control plane, and all of Kortix are source-available under non-OSI licenses, even though parts of each project are Apache-2.0 or MIT (Tabby LICENSE, OpenWork, Kortix LICENSE). Read the license before you describe a project as open source.

Sources

Every product fact above was fetched on 27 September 2026. The primary sources are github.com/kortix-ai/suna, kortix.com/docs, kortix.com/about, and kortix.com, together with each competitor's own repository or site linked in the tables.