Goose

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.

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.

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.

z.AI's flagship open-weight model released February 2026 with 744B total parameters (40B active). Designed for complex systems engineering and long-horizon agentic tasks. Integrates DeepSeek Sparse Attention for efficient long-context workloads. Strong in reasoning and code generation.

Amazon Nova Forge is AWS's enterprise LLM customization platform, launched in March 2026, that makes it easy to fine-tune and adapt Amazon Nova foundation models to domain-specific data without the usual complexity of dependency management or recipe configuration. It supports pre-training, supervised fine-tuning (SFT), and reinforcement fine-tuning (RFT), and includes a responsible AI toolkit for safety and content moderation settings. Nova Forge is accessible through Amazon Bedrock and SageMaker AI.

Kimi Code is an open-source AI coding agent developed by Moonshot AI, powered by the Kimi K2.5 multimodal model. It runs in your terminal and integrates with IDEs like VSCode, Cursor, and Zed, allowing you to use text, images, and videos as coding input. Launched in January 2026, it rivals Claude Code and Gemini CLI with strong SWE-Bench performance.