Agen is described as 'AI coding agent platform that runs autonomous, parallel agents across your codebase — so you can ship features, fix bugs, and refactor code without the constant back-and-forth of traditional AI assistants' and is a ai coding assistant in the development category. There are three alternatives to Agen, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux, Visual Studio Code and Neovim apps. The best Agen alternative is Claude Code. It's not free, so if you're looking for a free alternative, you could try Cursor or GitHub Copilot.