PlugBoard is an Application framework made in Python and built on top of setuptools and Zope interfaces which help the developer create a plugin-based application. The framework itself is very extensible, and allows the application to be extensible as well. An application is made up of a plugin resource (get all available plugins in the application), a context resource (organize plugins into different contexts), and an engine to let plugins communicate with each other into different environments (such as PlugBoard, GTK, Wx, Qt, Twisted, and so on) and provide some useful utilities.
pyWebSMS is a program which lets you send SMS through the Internet without opening a Web browser. You can send multiple SMS, save your contacts, view the history, and much more. It's completely modular, so you can add or remove providers for sending SMS. You can make your own module for your provider if one doesn't exists yet by programming it in Python.
Vanubi is a programming editor highly inspired by Emacs but with a more modern fashion. It aims to be unobtrusive yet smart, simple yet complete with the necessary components built in (monolithic), keyboard based with contextual help, file/directory based (not project based), and fast to open for rapid file editing. It features splitting views, auto indent, sessions, fuzzy search everywhere, git support with side gutter and grep, emacs-like and shell-like key bindings, integration with the shell, and an ad-hoc scripting language.