Vim

Vim (Vi IMproved) is a highly configurable, modal text editor: it delivers unparalleled efficiency for text manipulation via powerful keyboard commands and an extensive plugin system.

Vim is a ubiquitous, open-source text editor, initially released in 1991 by Bram Moolenaar as an improved version of the classic Unix editor, `vi`. Its core strength lies in modal editing (Normal, Insert, Visual, Command-line, etc.), which allows users to execute complex text operations with minimal keystrokes, keeping hands on the home row. This design makes it a favorite 'programmer's editor' for developers and system administrators across Linux, macOS, and Windows. Vim's functionality is vastly extensible through its internal scripting language, Vim script, and a robust plugin ecosystem, enabling features like syntax highlighting, IDE-like behavior, and integration with external tools (e.g., Python for JSON formatting).

https://www.vim.org/