Polypane Open-Source Alternative
Here's an open source alternative for those (like me) that don't feel like having to pay a subscription for every single tool they want to use:
https://github.com/responsively-org/responsively-app
https://github.com/responsively-org/responsively-app
GitHub
A modified web browser that helps in responsive web development. A web developer's must have dev-tool. - responsively-org/responsively-app
