Curated 550+ free AI tools useful for building projects (LLMs, APIs, local models, RAG, agents)

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Over the last few days I was collecting free or low cost AI tools that are actually useful if you want to build stuff, not just try random demos. Most lists I saw were either outdated, full of affiliate links, or just generic tools repeated everywhere, so I tried to make something more practical mainly focused on things developers can actually use. It includes things like free LLM APIs like OpenRouter Groq Gemini etc, local models like Ollama Qwen Llama, coding tools like Cursor Gemini CLI Qw...