Open Source CoffeeScript Terminals

Butterfly is a web-based, xterm-compatible terminal emulator written in Python, leveraging WebSockets and Tornado to allow users to access and interact with a terminal via their browser without plugins, featuring robust theming, multi-session support, browser-native features, and security mechanisms. Native browser scroll and search. Theming in css / sass (20 preset themes) endless possibilities. HTML in your terminal! cat images. Multiple sessions support (à la screen -x) to simultaneously access a terminal from several places on the planet. Secure authentication with X509 certificates.

The PlatformIO Atom IDE Terminal is a lightweight terminal package for the Atom editor that embeds a native shell right inside the editor UI. It provides a familiar terminal experience—shell history, colors, and interactive programs—without switching windows, which streamlines workflows when building, flashing, or debugging embedded firmware from PlatformIO or other toolchains. The integration supports multiple terminal tabs, configurable shells, and user-defined startup commands so each project pane can pre-load environment variables or virtualenvs. Because embedded development often requires frequent command-line interactions (builds, serial monitors, log watchers), having the terminal adjacent to code and the project tree significantly reduces context switching. The package is intentionally minimal and focuses on stability and responsiveness rather than trying to replace full-featured terminal emulators.