Sublime Text

A lightweight, simple, fast, feature-filled, and extremely extensible text editor written in C, and Lua, adapted from Lite.

KDevelop - A cross-platform IDE for C, C++, Python, QML/JavaScript and PHP

CodePen: Online Code Editor and Front End Web Developer Community

Full-featured Python IDE with editor, debugger, unit testing, error checking, refactoring, and much more. Designed for Python, for a more productive development experience.

有道云笔记是网易旗下专注办公提效的笔记软件，支持多端同步，用户可以随时随地对线上资料进行编辑、分享以及协同

A powerful Markdown editor for researchers and journalists.