DB Browser for SQLite is a popular, free tool for exploring these files.
In short: while not every IMDb feature is freely available, the official public datasets plus community tools provide a powerful, lawful starting point for many projects — from hobby visualizations to research-grade analyses. If you need help converting the IMDb text files into a searchable database or joining them with external metadata, I can provide a step-by-step script or schema to get you started. imdb database free