autonomous coding

Blitzy Sandbox

Autonomous coding agent that reverse-engineers large codebases and ships new features. The Sandbox lets you try it free on up to 1M lines of existing code and 25K lines of new features, with no credit card required.

From the site: Try Blitzy Sandbox free: reverse-engineer up to 1M lines of code and ship 25K lines of new features, no cost. Bring your own repo or start with a sample.