15 Must‑Know Python Open‑Source Frameworks for Modern Development

1. Django: Python Web Application Framework

Django is the most famous Python framework; it follows a “batteries‑included” approach and automatically generates database schemas and a full‑featured admin interface from simple ORM model definitions.

2. Diesel: Greenlet‑based Event I/O Framework

Diesel provides a clean API for writing network clients and servers, supporting both TCP and UDP.

3. Flask: Lightweight Python Web Framework

Flask is a micro‑framework built on Werkzeug and Jinja2. It offers a simple core that can be extended via extensions; it does not include a default database or authentication tools.

4. Cubes: Lightweight Python OLAP Framework

Cubes is a lightweight framework that provides OLAP, multidimensional analysis, and tools for browsing aggregated data.

5. Kartograph.py: Lightweight Vector‑Map Creation Framework

Kartograph.py generates SVG maps for ESRI; it is still in beta and can be tested in a virtualenv.

6. Pulsar: Event‑Driven Concurrency Framework

Pulsar enables writing asynchronous servers that run activities across multiple processes or threads.

7. Web2py: Full‑Stack Web Framework

Web2py offers a complete web‑application stack with rapid, secure, portable, database‑driven development and supports Google App Engine.

8. Falcon: High‑Performance Cloud API Framework

Falcon is a high‑performance framework for building cloud APIs, encouraging a REST style with minimal effort.

9. Dpark: Python Implementation of Spark

Dpark is a Python clone of Spark, providing a distributed computing framework for large‑scale data processing and iterative computation; it is used extensively within Douban.

10. Buildbot: Continuous Integration Testing Framework

Buildbot automates software build, test, and release processes across multiple platforms, triggering builds on code changes and reporting results.

11. Zerorpc: High‑Performance Distributed RPC Framework

Zerorpc builds on ZeroMQ and MessagePack to provide a remote procedure call protocol, usable via programming APIs or command line.

12. Bottle: Micro Python Web Framework

Bottle is a single‑file, WSGI‑compliant micro‑framework that has no external dependencies beyond the Python standard library.

13. Tornado: Asynchronous Non‑Blocking IO Web Framework

Tornado combines a web server and a Python web framework, originally developed at FriendFeed and later open‑sourced after Facebook’s acquisition.

14. webpy: Minimalist Python Web Framework

webpy aims for simplicity, providing only the essentials without URL routing, templating, or database layers.

15. Scrapy: Python Web‑Crawling Framework

Scrapy is a lightweight, easy‑to‑use framework for building web crawlers.