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Parallel Code

Free
CodeCodeProductivity

Parallel Code runs multiple AI coding agents simultaneously, each in its own isolated git worktree, so you can tackle ten features in one afternoon with zero merge conflicts. It works with Claude Code, Codex CLI, and Gemini CLI — letting you describe what you want built, pick your agent, and review diffs side-by-side before merging the best result. Free and open source under the MIT license.

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GStack

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GStack is an open-source Claude Code workflow system created by Y Combinator CEO Garry Tan, designed to encode specialized AI roles for planning, code review, QA, and shipping. Built with Bun and Playwright, it uses route-aware QA and structured release workflows to connect code changes with actual application behavior. Enables developers to achieve 10,000+ lines of quality code per week.

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Cursor Composer 2

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Cursor Composer 2 is an advanced agentic coding model built into the Cursor IDE, released March 19, 2026. With a 200,000-token context window, it autonomously plans and executes complex, multi-file coding tasks across an entire codebase — handling file edits, terminal operations, and tool use at frontier-level performance. It is used by over 50,000 businesses including Stripe.

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Kilo Code

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Free

Kilo Code is an open-source AI coding agent for VS Code, JetBrains, and CLI that generates code from natural language, automates complex tasks, and runs terminal commands. It supports 500+ AI models at provider rates and features an Orchestrator mode that breaks complex tasks into coordinated subtasks across planner, coder, and reviewer agents. With 1.5M+ users and 25T+ tokens processed, it's the #1 coding agent on OpenRouter.

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Fabricate

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AI tool that generates complete web applications from natural language prompts. Users describe what they want to build and Fabricate creates functional apps with frontend, backend, and database integration.

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Warp

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Warp is an AI-native agentic development environment built from the ground up for developers. It features natural-language command generation, multi-agent orchestration via Oz (launched February 2026), and IDE-style terminal editing — letting developers describe tasks in plain English and have AI agents build, debug, and ship code autonomously. Over 700K developers use Warp with Pair and Dispatch agent modes for local and cloud-based agentic workflows.

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NousCoder-14B

Code
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Free

NousCoder-14B is an open-source competitive programming model by Nous Research, post-trained on Qwen3-14B via reinforcement learning. It achieves 67.87% Pass@1 accuracy on LiveCodeBench v6, competing directly with proprietary models like Claude Code and GitHub Copilot. Available free to download and run on Hugging Face.

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