Gmsoft Dev Tools is a free Chrome add-on developed by julyWind. It is designed to assist front-end developers in their workflow by providing features such as interface cookie injection and quick password filling.

With Gmsoft Dev Tools, front-end developers can easily inject cookies into their development environment's interface. This allows them to test and debug their applications more efficiently by simulating different user scenarios. By injecting custom cookies, developers can replicate specific user sessions and observe how their application behaves under different conditions.

Another useful feature of Gmsoft Dev Tools is its ability to quickly fill passwords. This can be particularly helpful when working on projects that require frequent login attempts or password changes. With just a few clicks, developers can populate password fields, saving time and effort.

Overall, Gmsoft Dev Tools is a valuable addition to any front-end developer's toolkit. Its cookie injection and password filling capabilities streamline the development process, making it easier to test and debug applications.