GPT Engineer

GPT Engineer scaffolds whole projects from a specification: you write the spec, answer its clarifying questions, and it produces the files, working in the terminal rather than a browser. It is the open-source ancestor of a product — Lovable — and the repository now describes itself plainly as a precursor to it.

It suits someone who wants the generation engine without the hosted product around it, is comfortable in a command line, and would rather read and adjust the output than trust it blind. It suits less well anyone expecting a maintained, product-grade tool: this is the experimental CLI that started a category, and the current work happens elsewhere.

Not verified: no project was generated, so output quality is untested here. The repository's own description points to a successor product, which means the maintenance question should be answered before adoption; how active development is today was not measured on this pass, and the spec-driven workflow's limits on real, messy codebases were not exercised.