Google Translate — 130+ languages, camera/voice (Free: Essentially unlimited)
Streamlit — Python scripts → interactive data apps (Free: Free + unlimited public apps)
Windsurf — AI-native editor with Cascade agent — free tier with GPT-4.1 and Claude access (Free: Free tier with GPT-4.1 and Claude access; generous limits)
Google NotebookLM — AI research — 100 notebooks, audio overviews (Free: 100 notebooks, 50 sources each)
Arize Phoenix — Open-source LLM observability — traces, evaluations, experiments, prompt tracking in a single dashboard (Free: Fully open source; self-hosted)
Cursor — AI-first code editor with intelligent completions and refactoring (Free: Starter plan: basic completions free)