- Visual Studio Code
See also Python#IDE
- TKE - a full-featured source code editor with a minimalist UI.This editor is primarily written for programmers and contains support for many programming languages, syntax highlighting, optional built-in Vim support, multi-cursor/selection support, plugin support and many other features. The the feature list below for more details. 
- Code::Blocks - a free C, C++ and Fortran IDE built to meet the most demanding needs of its users. It is designed to be very extensible and fully configurable.Finally, an IDE with all the features you need, having a consistent look, feel and operation across platforms.Built around a plugin framework, Code::Blocks can be extended with plugins. Any kind of functionality can be added by installing/coding a plugin. For instance, compiling and debugging functionality is already provided by plugins!
Simple Teaching Assistant
- Lamdu - aims to create a next-generation live programming environment that radically improves the programming experience.