Software:
Python Programming Language - Official Website
ActivePython (Free, Windows)
— ActivePython is the industry-standard Python distribution, available for Windows, Linux, Mac OS X, Solaris, AIX and HP-UX.
Twisted – Trac
— Twisted is an event-driven networking engine written in Python and licensed under the MIT license.
Django
— Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.

Development:
Eclipse
— Eclipse is an open source community whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle. A large and vibrant ecosystem of major technology vendors, innovative start-ups, universities, research institutions and individuals extend, complement and support the Eclipse platform.
PyDev for Eclipse
— PyDev is a plugin that enables users to use Eclipse for Python and Jython development — making Eclipse a first class Python IDE — It comes with many goodies such as code completion, syntax highlighting, syntax analysis, refactor, debug and many others.

Document:
简明 Python 教程
— 入门：无论您刚接触电脑还是一个有经验的程序员，本书都将有助您学习使用Python语言。
Python食谱
— 进阶：有效而实用的 pythonCookBook 浅显明了
深入 Python :Dive Into Python 中文版
— 深入：Dive Into Python 是为有经验的程序员编写的一本 Python 书。