Best Open Source AI Coding Agents using Testing Library in 2026

Cline

Open-source AI coding agent with frontier models

Stars
60,580
Forks
6,229
Last commit
4 hours ago

Open-source AI coding agent offering direct access to frontier models with complete transparency. Features Plan Mode, MCP integration, and zero vendor lock-in.

Open Source Alternative to:

Claude Code

OpenHands

Open-source platform for scalable cloud coding agents

Stars
71,763
Forks
9,039
Last commit
4 hours ago

Build and deploy autonomous coding agents at scale with model-agnostic, secure platform. Automate code reviews, testing, documentation, and complex refactoring tasks.

Open Source Alternative to:

Claude Code

Plandex

AI coding agent that handles large-scale development tasks

Stars
15,275
Forks
1,123
Last commit
7 months ago

Terminal-based AI coding assistant with 2M token context window, diff review sandbox, and smart context management for building production-ready software.

Open Source Alternative to:

Claude Code

Emdash

Code Smarter with Parallel Agents

Stars
4,057
Forks
368
Last commit
5 hours ago

Orchestrate multiple coding agents in parallel for seamless development. Isolated Git worktrees ensure organized workflows.

Open Source Alternative to:

Warp

OmoiOS

Ship features while you sleep with autonomous AI agents

Stars
42
Forks
3
Last commit
11 days ago

Deploy AI agents that build features, fix bugs, and handle complex workflows overnight. Wake up to tested code and ready-to-review pull requests.

Open Source Alternative to:

Cursor

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Cline

Open-source AI coding agent with frontier models

Stars
60,580
Forks
6,229
Last commit
4 hours ago

Open-source AI coding agent offering direct access to frontier models with complete transparency. Features Plan Mode, MCP integration, and zero vendor lock-in.

Open Source Alternative to:

Claude Code

OpenHands

Open-source platform for scalable cloud coding agents

Stars
71,763
Forks
9,039
Last commit
4 hours ago

Build and deploy autonomous coding agents at scale with model-agnostic, secure platform. Automate code reviews, testing, documentation, and complex refactoring tasks.

Open Source Alternative to:

Claude Code

Plandex

AI coding agent that handles large-scale development tasks

Stars
15,275
Forks
1,123
Last commit
7 months ago

Terminal-based AI coding assistant with 2M token context window, diff review sandbox, and smart context management for building production-ready software.

Open Source Alternative to:

Claude Code

Emdash

Code Smarter with Parallel Agents

Stars
4,057
Forks
368
Last commit
5 hours ago

Orchestrate multiple coding agents in parallel for seamless development. Isolated Git worktrees ensure organized workflows.

Open Source Alternative to:

Warp

OmoiOS

Ship features while you sleep with autonomous AI agents

Stars
42
Forks
3
Last commit
11 days ago

Deploy AI agents that build features, fix bugs, and handle complex workflows overnight. Wake up to tested code and ready-to-review pull requests.

Open Source Alternative to:

Cursor

Open Source AI Coding Agents using Testing Library

A curated collection of the best open source tools that use AI to write, debug, and optimize code automatically, helping developers build software faster with intelligent suggestions and automated programming assistance. using Testing Library.