Open Source Flask Alternatives

A modern, fast and highly-performant web framework written in Python. With FastAPI developers can quickly build APIs with performance on par with Node.js and Go thanks to Starlette and Pydantic.

Django is a high-level Python web development framework used for building web application at scale with speed. The framework adhere to a clean and pragmatic design that lets developers develop rapidly. Django ships as a "batteries included" framework and contains many of the features needed for most web applications such as an admin panel, an ORM and templating language. It takes much of the hassle out of web development and lets developers focus on writing their application instead of focusing on authentication, authorization and security.

Bottle is a fast, simple and lightweight WSGI micro web-framework for Python. The framework can be used to create lean web applications with Python 2.7 and 3.x. Bottle is distributed as a single file module with no additional dependencies which makes it really easy to get started and later in the development-stage to manage.

CherryPy is a free and open-source object-oriented HTTP and web framework written in Python. CherryPy allows developer to build web application the same way they would build any other object-oriented program. The design of CherryPy result in a simpler and faster development experience with more readable code. CherryPy is distributed under a BSD license and loved by many Python web developers.

A free and open-source web framework and asynchronous networking library written in Python. Tornado was originally developed at FriendFeed, and is using a non-blocking network I/O that can be used to scale applications to tens of thousands of concurrent connection. Tornado is a great framework for applications that require long-lived connections between users, and for WebSockets or long polling.

Pyramid is a web framework written in Python that makes it easy to write applications for the web. With Pyramid, you can start small and finish big. Pyramid offers many features suited for writing both simple and complex software, while providing clear structure as your application grows. Since 1995, the Pyramid team has stayed devoted to professional craftmenship with a deep commitment to quality, which is seen throughout the Pyramid framework and the developer experience and workflow it provide for developers. Pyramid is released free and open-source under the Zope Public License (ZPL) Version 2.1.

Amber is a web framework written in the programming language Crystal that makes building web applications fast, simple, and enjoyable. The Amber Framework provides productivity and happiness through a powerful CLI and familiar design patterns seen in Kemal, Rails, Phoenix and other popular frameworks. With the Amber Framework you can build blazing fast web applications that your users will love.

AdonisJS is a Node.js web framework designed for building micro-services with JavaScript and Typescript. The framework provides an elegant syntax and and the tools that gives developers the confidence to build structured projects at scale. AdonisJS also includes its own ORM called Lucid, which is an implementation of Active Record, written in JavaScript. The framework will make anyone coming from Laravel or Ruby on Rails to feel right at home in the JavaScript eco-system.

Egg.js is a free and open-source JavaScript and Node.js framework for building better enterprise applications.

Laravel is an extremely popular, free and open source web application framework with expressive, elegant syntax. The framework is written in PHP and provides a developer experience that rival most web application frameworks on the market today. The structure and built-in features of Laravel allows developers to build web applications faster. Instead of setting up tooling and configuring settings, developers can focus on the important task at hand, making their ideas into reality.

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At its core, Phoenix is a rock-solid web framework that improves the tried and true Model-View-Controller (MVC) architecture with a fresh set of functional ideas. Phoenix puts the focus on your business domain, bringing you immediate productivity and long-term code maintainability. Versatility at your fingertips. The Phoenix Framework also provides the concept and implementation of LiveView, allowing you as a developer to build real-time application using the power of elixir and websockets.