web.go : web.go is the simplest way to write web applications in the Go programming language. It's ideal for writing simple, performant backend web services.
Beego : An open source framework to build and develop your applications in the Go way
Revel : A high-productivity web framework for the Go language.
Pyramid : Pyramid is a very general open source Python web framework.
Flask : Flask is a microframework for Python based on Werkzeug, Jinja 2 and good intentions. And before you ask: It's BSD licensed!
Fiber is an Express inspired web framework build on top of Fasthttp, the fastest HTTP engine for Go. Designed to ease things up for fast development with zero memory allocation and performance in mind.