# Environments > [!NOTE] > The environments listed here may not reflect the latest additions. For the official OpenEnv collection, see the [OpenEnv organization on Hugging Face](https://huggingface.co/openenv). You may also find additional community environments tagged `agent-environment` on [Hugging Face Spaces](https://huggingface.co/spaces?category=agent-environment). The environments highlighted below are a curated selection. The OpenEnv community has built a catalog of ready-to-run environments that cover deterministic smoke tests, full developer workflows, and multi-step reasoning challenges. Explore the surface area below and jump directly into the guides for each environment. Echo Minimal observation/action loop for verifying client integrations, CI pipelines, and onboarding flows in seconds. 📄 Docs 🤗 HF Coding Secure sandbox with filesystem access and evaluation hooks for executing generated code and building autonomous dev workflows. 📄 Docs 🤗 HF Jupyter Notebook-style coding environment backed by E2B with setup/verify hooks and a web UI for interactive runs. 📄 Docs Terminus Terminal-first coding environment with high-contrast shell output and session controls for execute/verify/close flows. 📄 Docs Coding Tools SETA-style multi-tool coding environment with shell, file editing, search, todos, and submit verification. 📄 Docs Chat Message-driven loop tailored for conversational agents that need structured turns, safety rails, and message attribution. 📄 Docs 🤗 HF Atari Classic Arcade Learning Environment tasks packaged for fast benchmarking of reinforcement-learning style agents. 📄 Docs 🤗 HF OpenSpiel Multi-agent, game-theory workloads powered by DeepMind's OpenSpiel suite, ideal for search and self-play experiments. 📄 Docs 🤗 HF SUMO-RL Traffic control scenarios with SUMO simulators for agents that reason about continuous control and scheduling. 📄 Docs FinRL Financial market simulations with portfolio APIs, perfect for RLHF strategies and algorithmic trading experiments. 📄 Docs TextArena Multi-task text arena for language-game competitions such as Wordle, reasoning puzzles, and program synthesis. 📄 Docs 🤗 HF Git Teaches agents to navigate repositories, inspect diffs, and land changes via Git-native operations. 📄 Docs DIPG Safety Safety-critical diagnostics from the DIPG benchmark, highlighting guardrails, adversarial prompts, and risk scoring. 📄 Docs 🤗 HF Snake Classic snake game environment for RL research with configurable grids, partial observability, and customizable rewards. 📄 Docs 🤗 HF Web Search Web search environment for RL research with configurable grids, partial observability, and customizable rewards. 📄 Docs 🤗 HF BrowserGym Browser automation environment for web agents with DOM interaction, navigation, and multi-step task completion. 📄 Docs 🤗 HF KernRL RL environment for GPU kernel optimization. Train LLM agents to write fast CUDA/Triton kernels that beat baseline implementations. 📄 Docs Calendar Calendar tool-use environment exposing a Calendar Gym through the OpenEnv reset/step/state interface for scheduling agents. 📄 Docs CARLA Embodied evaluation environment for testing LLM decision-making in a full 3D driving simulator with irreversible consequences and ethical trolley scenarios. 📄 Docs 🤗 HF Chess Chess RL environment powered by the moonfish engine with configurable opponents, position evaluation, and full chess rules. 📄 Docs Connect4 Classic Connect Four board game environment for training agents on turn-based strategy with a 6×7 grid. 📄 Docs DM Control Generic OpenEnv wrapper for dm_control.suite, providing access to all MuJoCo-based continuous control tasks like cartpole, walker, and humanoid. 📄 Docs FinQA Financial question-answering environment that evaluates LLMs on complex financial questions using tool calls on SEC 10-K filing data. 📄 Docs Grid World Simple 5×5 grid world RL testbed and step-by-step guide for building new OpenEnv environments from scratch. 📄 Docs 🤗 HF Julia Julia code execution environment with test result tracking and reward calculation for RL training on Julia programming tasks. 📄 Docs Maze Gridworld maze where agents navigate from start to exit while avoiding walls, with configurable 8×8 layouts. 📄 Docs OpenApp Web application simulation wrapping the OpenApps framework and BrowserGym for training UI agents on calendar, todo, messenger, and maps apps. 📄 Docs Reasoning Gym Integrates the Reasoning Gym library to provide single-step reasoning tasks with configurable datasets and scoring. 📄 Docs REPL Python REPL environment for code execution tasks based on the Recursive Language Models paradigm with sandboxed execution and context loading. 📄 Docs TB2 OpenEnv wrapper for Terminal-Bench 2 tasks with local and Docker execution modes for terminal-based agent evaluation. 📄 Docs Unity OpenEnv wrapper for Unity ML-Agents environments, providing access to Unity's RL environments through HTTP/WebSocket interfaces. 📄 Docs Wildfire Autonomous wildfire-control simulation where agents contain spreading fires using water, firebreaks, and timing under dynamic conditions. 📄 Docs Agent World Model AgentWorldModel-1K — 1,000 synthetic MCP tool-use environments with 10,000 tasks for large-scale agentic RL training. 📄 Docs 🤗 HF OpenCode opencode_env runs the OpenCode coding agent inside an isolated E2B sandbox against any OpenAI-compatible LLM endpoint, optionally capturing per-token logprobs. 📄 Docs > [!TIP] > Want to publish your own environment? Head over to the [Build Your Own Environment](getting_started/environment-builder) guide for a step-by-step walkthrough. ## Community Environments RLVE Gym A suite of 400 environments that procedurally generate reasoning problems for LM training with configurable difficulty. 📄 Docs 🤗 HF