The developer stack, from inline completion to autonomous agents to the APIs and local runtimes you call from your own code.
Flocci AI Tools lists 103 of them, ordered free tiers first: Eclipse Theia IDE, OpenHands, Agno, Aider and AnythingLLM. 92 of the 103 are free or have a free tier. Each entry states what it uniquely does rather than a score.
58 on this page are marked fully free with no paid plan at all: Eclipse Theia IDE, OpenHands, Agno, Aider and AnythingLLM. The remaining 45 are freemium, trial or paid, and each is labelled with its exact tier so nothing surprises you at sign-up.
They are every catalog entry in 7 sub-categories that map to what developers actually do: write code faster, refactor across a repo, run an agent on a ticket, call a hosted model, run a model offline. There is no sponsorship and no paid placement anywhere in the ordering.
Eclipse Theia IDE, OpenHands, Amazon Q Developer, Baseten and Cloudflare Workers AI all work in a browser tab with no install needed — just open the site and go. 18 of the 92 free Best AI Tools for Developers listed here are browser-based.
Cloudflare Agents SDK, Gemini CLI, Freebuff, GitHub Copilot and Google AI Studio support Google sign-in, so you can start without creating a new account. That's 11 of the 92 free Best AI Tools for Developers on this page.
AnythingLLM, Google AI Edge Gallery, KoboldCpp, MediaPipe (Google AI Edge) and MLC LLM have an iOS or Android app. 9 of the 92 free Best AI Tools for Developers here can run on your phone.
Agno, Aider, AnythingLLM, AWS Strands Agents and BitNet can be self-hosted or run locally without a browser — useful for privacy, air-gapped networks, or avoiding API rate limits. 64 of the 92 free Best AI Tools for Developers here run offline.
| Tool | Pricing | Type | Listed for |
|---|---|---|---|
| Eclipse Theia IDE | Free | AI IDEs & Editors | Open-source, vendor-neutral IDE with AI agents built on Theia AI |
| OpenHands | Free | Autonomous Coding Agents | Self-hosted control center for coding agents with GUI, CLI and SDK surfaces |
| Agno | Free | Agent Frameworks (Developers) | Open-source (Apache-2.0) Python framework, 41.7k GitHub stars |
| Aider | Free | Terminal & CLI Agents | Open-source AI pair programmer in your terminal |
| AnythingLLM | Free | Local LLM Runners | All-in-one local RAG and agents app |
| AWS Strands Agents | Free | Agent Frameworks (Developers) | Open-source (6,800+ stars) Python and TypeScript SDK from AWS |
| BitNet | Free | Local LLM Runners | Official inference framework for 1-bit (ternary) LLMs |
| CAMEL | Free | Agent Frameworks (Developers) | Open-source multi-agent framework focused on scaling agent societies and role-playing |
| Claude Agent SDK | Free | Agent Frameworks (Developers) | MIT-licensed Python and TypeScript SDKs exposing the agent loop that powers Claude Code |
| Cline | Free | Terminal & CLI Agents | Open-source autonomous coding agent for VS Code |
| Cloudflare Agents SDK | Free | Agent Frameworks (Developers) | Framework for building and deploying stateful AI agents on Cloudflare Workers |
| Continue | Free | Code Autocomplete & Assistants | Apache-2.0 open-source coding agent for VS Code, JetBrains and the CLI |
| Crush | Free | Terminal & CLI Agents | Terminal coding agent from Charm with LSP-aware context |
| DSPy | Free | Agent Frameworks (Developers) | Open-source (MIT) framework from Stanford NLP, 37k+ GitHub stars |
| exo | Free | Local LLM Runners | Links everyday devices (Macs, PCs, phones) into one cluster to run models too large for a single machine |
| Firebase Genkit | Free | Agent Frameworks (Developers) | Open-source framework for AI apps in JavaScript, Go, Dart and Python |
| Gemini CLI | Free | Terminal & CLI Agents | Open-source terminal agent from Google |
| Google Agent Development Kit (ADK) | Free | Agent Frameworks (Developers) | Open-source Python/Java framework from Google for building multi-agent systems |
| Google AI Edge Gallery | Free | Local LLM Runners | Runs Gemma models fully on-device on Android and iOS, offline after one model download |
| Goose | Free | Terminal & CLI Agents | Open-source agent (now under Agentic AI Foundation/Linux Foundation) usable as CLI, desktop app or API |
| GPT4All | Free | Local LLM Runners | Private local chat with your documents |
| Haystack | Free | Agent Frameworks (Developers) | Apache-2.0 framework for context-engineered, production RAG and agent pipelines |
| Jan | Free | Local LLM Runners | Open-source, offline ChatGPT alternative |
| Kimi Code CLI | Free | Terminal & CLI Agents | MIT-licensed terminal coding agent from Moonshot AI that edits files, runs shell commands and uses MCP |
| KoboldCpp | Free | Local LLM Runners | Ships as a single portable executable with a bundled web UI (KoboldAI Lite) |
| LangChain | Free | Agent Frameworks (Developers) | MIT-licensed framework of model, tool and retrieval integrations for agents |
| LangChain Deep Agents | Free | Agent Frameworks (Developers) | Batteries-included agent harness with planning, sub-agents and a virtual file system |
| LangGraph | Free | Agent Frameworks (Developers) | Build stateful, multi-agent apps as graphs |
| llama.cpp | Free | Local LLM Runners | Pure C/C++ inference engine with minimal dependencies, runs on CPU-only hardware |
| llamafile | Free | Local LLM Runners | Packs model weights and runtime into one executable that runs on macOS, Windows and Linux |
| LM Studio | Free | Local LLM Runners | Polished desktop GUI for local models |
| LocalAI | Free | Local LLM Runners | Drop-in OpenAI-compatible API server running models on your own hardware, CPU or GPU |
| Mastra | Free | Agent Frameworks (Developers) | Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG |
| MediaPipe (Google AI Edge) | Free | Local LLM Runners | Cross-platform on-device ML for vision, audio, text and LLM inference |
| Microsoft Agent Framework | Free | Agent Frameworks (Developers) | Unified open-source framework for building and orchestrating multi-agent systems in Python and .NET |
| Microsoft AutoGen | Free | Agent Frameworks (Developers) | Multi-agent conversation framework |
| mini-SWE-agent | Free | Autonomous Coding Agents | Roughly 100-line agent that solves GitHub issues or works in your command line |
| Mistral Vibe | Free | Terminal & CLI Agents | Apache-2.0 minimal terminal coding agent built around Devstral models |
| MLC LLM | Free | Local LLM Runners | Compiles and runs LLMs natively on iOS, Android, browsers (WebGPU), Mac, Windows and Linux |
| MLX-LM (Apple) | Free | Local LLM Runners | Purpose-built for Apple Silicon's unified memory architecture, faster than llama.cpp for many models on Mac |
| Ollama | Free | Local LLM Runners | The default way to run LLMs locally |
| Open SWE | Free | Autonomous Coding Agents | Open-source asynchronous coding agent from LangChain |
| Open WebUI | Free | Local LLM Runners | Self-hosted ChatGPT-style interface |
| OpenAI Agents SDK | Free | Agent Frameworks (Developers) | Lightweight agent orchestration from OpenAI |
| OpenCode | Free | Terminal & CLI Agents | Fully open-source terminal/IDE/desktop coding agent, MIT licensed |
| OpenSandbox (Alibaba) | Free | Agent Frameworks (Developers) | Secure, fast runtime for executing untrusted AI-generated code |
| Pydantic AI | Free | Agent Frameworks (Developers) | Type-safe Python agent framework from the Pydantic team, validated structured outputs |
| Qwen Code | Free | Terminal & CLI Agents | Open-source terminal CLI adapted from Gemini CLI, tuned for Qwen3-Coder models |
| Qwen-Agent | Free | Agent Frameworks (Developers) | Agent framework built on Qwen 3+ with function calling, MCP and code interpreter |
| Semantic Kernel | Free | Agent Frameworks (Developers) | MIT SDK for integrating LLMs into C#, Python and Java apps |
| SGLang | Free | Local LLM Runners | RadixAttention for automatic prefix-cache reuse across requests |
| smolagents | Free | Agent Frameworks (Developers) | Extremely minimal open-source library (~1,000 lines) from Hugging Face |
| SWE-agent | Free | Autonomous Coding Agents | Takes a GitHub issue and tries to fix it automatically with your LM of choice |
| Tabby | Free | Code Autocomplete & Assistants | Self-hosted AI coding assistant with completion and chat |
| Trae Agent | Free | Terminal & CLI Agents | Open-source CLI agent for general software-engineering tasks |
| Vercel AI SDK | Free | Agent Frameworks (Developers) | TypeScript toolkit for streaming text, tool calls and agents across many model providers |
| vLLM | Free | Local LLM Runners | PagedAttention memory management for high-throughput multi-request GPU serving |
| VoltAgent | Free | Agent Frameworks (Developers) | Open-source TypeScript agent framework with memory, tools and sub-agents |
| Amazon Q Developer | Freemium | Code Autocomplete & Assistants | AWS-savvy coding assistant and agents |
| Baseten | Freemium | Model Hosting & Inference APIs | Basic plan is pay-as-you-go with free starter credits for new accounts |
| Cloudflare Workers AI | Freemium | Model Hosting & Inference APIs | 10,000 free 'Neurons' of inference per day on every account, resetting daily |
| Cohere Trial API | Freemium | Model Hosting & Inference APIs | Every account gets a free Trial API key covering chat, embed and rerank models |
| Fireworks AI | Freemium | Model Hosting & Inference APIs | High-performance open-model serving |
| Freebuff | Freemium | Terminal & CLI Agents | Terminal coding agent that needs no API key, subscription or card; funded by small text ads shown in the CLI |
| GitHub Copilot | Freemium | Code Autocomplete & Assistants | The most widely used AI pair programmer |
| Google AI Studio | Freemium | Model Hosting & Inference APIs | Free-tier API access to Gemini Flash-family models with generous token allowances, no credit card required to start |
| Google Jules | Freemium | Autonomous Coding Agents | Async coding agent that fixes issues & PRs |
| Groq | Freemium | Model Hosting & Inference APIs | Ultra-fast inference on custom LPUs |
| Hugging Face | Freemium | Model Hosting & Inference APIs | The hub for open models and datasets |
| Kiro | Freemium | AI IDEs & Editors | AWS's spec-driven agentic IDE |
| ModelScope | Freemium | Model Hosting & Inference APIs | Alibaba's open model hub with thousands of Qwen, Wan and community models |
| Novita AI | Freemium | Model Hosting & Inference APIs | Single API surface for 200+ LLM/image/video/audio models plus on-demand GPU and bare-metal instances |
| OpenRouter | Freemium | Model Hosting & Inference APIs | One API for 400+ models across providers |
| Z.ai Open Platform (free GLM Flash API) | Freemium | Model Hosting & Inference APIs | GLM-4.7-Flash and GLM-4.5-Flash text models listed as free for input and output on the public API |
| Amp | Freemium | Terminal & CLI Agents | Multi-model routing across frontier models with no artificial usage caps |
| CodeBuddy (Tencent) | Freemium | AI IDEs & Editors | Tencent Cloud's AI code editor plus plugins and CLI |
| CrewAI | Freemium | Agent Frameworks (Developers) | Role-based multi-agent 'crews' |
| Cursor | Freemium | AI IDEs & Editors | AI-first VS Code fork with agent mode |
| GitHub Copilot CLI | Freemium | Terminal & CLI Agents | GitHub-native terminal agent that works directly with issues and PRs |
| Google Antigravity | Freemium | AI IDEs & Editors | Google's agent-first IDE |
| JetBrains Junie | Freemium | AI IDEs & Editors | Autonomous coding agent embedded in JetBrains IDEs (IntelliJ, PyCharm, WebStorm) |
| Kilo Code | Freemium | Terminal & CLI Agents | Same open-source agent usable in VS Code, JetBrains, CLI and cloud from one account |
| LlamaIndex | Freemium | Agent Frameworks (Developers) | Leading framework for RAG and data agents |
| Msty | Freemium | Local LLM Runners | Nexus module: unified gateway for managing model connections, credentials and usage policy across providers |
| NVIDIA Build | Freemium | Model Hosting & Inference APIs | Hosted catalog of 100+ open and NVIDIA models with an OpenAI-compatible endpoint |
| OpenAI Codex CLI | Freemium | Terminal & CLI Agents | #1 on Terminal-Bench with GPT-5-series |
| Qoder | Freemium | AI IDEs & Editors | Multi-agent collaboration IDE from Alibaba |
| Tabnine | Freemium | Code Autocomplete & Assistants | Privacy-first completions (can run air-gapped) |
| Trae | Freemium | AI IDEs & Editors | ByteDance's free AI IDE |
| Warp | Freemium | Terminal & CLI Agents | Terminal rebuilt as an agentic development environment for any coding agent |
| Windsurf | Freemium | AI IDEs & Editors | Agentic IDE with the Cascade flow |
| Zed | Freemium | AI IDEs & Editors | Blazing-fast, Rust-built editor |
| Cerebras Inference | Trial | Model Hosting & Inference APIs | Runs open models on Cerebras Wafer-Scale Engine hardware at dramatically higher tokens/sec than GPU-based APIs |
| Replicate | Trial | Model Hosting & Inference APIs | Run open models with one API call |
| Claude Code | Paid | Terminal & CLI Agents | Terminal-native agent, best on large codebases |
| DeepInfra | Paid | Model Hosting & Inference APIs | Very low per-token pricing across a large catalog of open models (text, image, audio) |
| Devin | Paid | Autonomous Coding Agents | Most autonomous cloud coding agent |
| Nebius Token Factory | Paid | Model Hosting & Inference APIs | European GPU-cloud-backed inference API hosting major open models (Llama, Qwen, DeepSeek, etc.) |
| SambaNova Cloud | Paid | Model Hosting & Inference APIs | Hosts open models (DeepSeek, MiniMax, Llama) on SambaNova's own RDU chips for high-speed inference |
| Together AI | Paid | Model Hosting & Inference APIs | Fast, cheap open-model inference |
| Augment Code | Paid | AI IDEs & Editors | Context Engine built for very large enterprise codebases |
| Factory | Paid | Autonomous Coding Agents | Enterprise 'Droids' across the whole SDLC |
| Sourcegraph Cody | Paid | Code Autocomplete & Assistants | Deep whole-codebase context |