Free
OpenCode
Open SourceAI Coding Assistants · AI for Developers
Open-source AI coding agent for the terminal, model-agnostic.
ai-codingagentcliopen-source
AI for Developers•Free•19 tools
Best Free AI for Developers Tools (19 Curated)
Discover the 19 best free tools for ai for developers. Free-to-use, no credit card or subscription required. Curated, compared, and updated for developers.
Quick Comparison (19 Tools)
| Tool | Pricing | Platforms | Top Strength | Link |
|---|---|---|---|---|
| OpenCode | free | cli | Open-source AI coding agent for the terminal, model-agnostic. | Details → |
| Aider | free | cli | AI pair programming in your terminal, works with Git. | Details → |
| Roo Code | free | extension | Community-driven AI dev agent for VS Code with multiple modes. | Details → |
| Llama | free | web | Meta's open-weight LLM family with downloadable weights. | Details → |
| Qwen | free | web | Alibaba's open-weight model family with multilingual strengths. | Details → |
| Ollama | free | desktop, cli | One command to run any open model locally — privacy by default | Details → |
| vLLM | free | cli | High-throughput, memory-efficient LLM inference and serving engine. | Details → |
| LiteLLM | free | cli, web | Open-source LLM gateway: one API for 100+ providers. | Details → |
| Promptfoo | free | cli | Open-source tool for testing and evaluating LLM prompts and models. | Details → |
| MCP | free | web | One protocol connects any AI assistant to any tool/data source | Details → |
Showing top 10 of 19. Browse the full grid below.
Free
Aider
Open SourceAI Coding Assistants · AI for Developers
AI pair programming in your terminal, works with Git.
ai-codingcligitopen-source
Free
Roo Code
Open SourceAI Coding Assistants · AI for Developers
Community-driven AI dev agent for VS Code with multiple modes.
ai-codingagentvs-codeopen-source
Free
Models & LLM APIs · AI for Developers
Meta's open-weight LLM family with downloadable weights.
aillmllamaopen-source
Free
Qwen
Open SourceModels & LLM APIs · AI for Developers
Alibaba's open-weight model family with multilingual strengths.
aillmqwenopen-source
Free
Ollama
Open SourceModels & LLM APIs · AI for Developers
Run open LLMs locally with one command.
ailocalllminference
Free
vLLM
Open SourceModels & LLM APIs · AI for Developers
High-throughput, memory-efficient LLM inference and serving engine.
aiinferenceservinggpu
Free
LiteLLM
Open SourceModels & LLM APIs · AI for Developers
Open-source LLM gateway: one API for 100+ providers.
aigatewayproxyllm
Free
Promptfoo
Open SourceAgent & LLM Frameworks · AI for Developers
Open-source tool for testing and evaluating LLM prompts and models.
aievaluationtestingprompts
Free
MCP
Open SourceMCP · AI for Developers
The open standard connecting AI models to tools and data sources.
mcpaiprotocoltools
Free
LangGraph
Open SourceAgent & LLM Frameworks · AI for Developers
Build stateful, multi-agent AI applications as graphs.
aiagentsgraphspython
Free
AutoGen
Open SourceAgent & LLM Frameworks · AI for Developers
Microsoft's framework for multi-agent AI conversations.
aiagentsmulti-agentmicrosoft
Free
Goose
Open SourceAI Coding Assistants · AI for Developers
Block's open-source extensible AI coding agent for the terminal.
ai-codingagentcliopen-source
Free
llama.cpp
Open SourceModels & LLM APIs · AI for Developers
The C/C++ inference engine that runs LLMs everywhere, even laptops.
ailocalinferencec++
Free
Stable Diffusion WebUI
Open SourceAgent & LLM Frameworks · AI for Developers
The classic browser UI for Stable Diffusion image generation.
aiimage-generationdiffusiontrending
Free
Whisper
Open SourceModels & LLM APIs · AI for Developers
OpenAI's open-source speech recognition model.
aispeech-to-texttranscriptiontrending
Free
Codex CLI
Open SourceAI Coding Assistants · AI for Developers
OpenAI's open-source coding agent for your terminal.
ai-codingagentcliopenai
Free
Prompt Engineering Guide
Open SourceAgent & LLM Frameworks · AI for Developers
The most comprehensive open guide to prompting techniques.
aipromptslearningguide
Free
Jan
Open SourceModels & LLM APIs · AI for Developers
Open-source ChatGPT alternative that runs LLMs fully offline on your machine, with an OpenAI-compatible API.
llmlocalofflineassistant