replxx is described as 'A readline and libedit replacement that supports UTF-8, syntax highlighting, hints and Unixes and Windows, and is BSD licensed' and is an app. There are four alternatives to replxx for Linux, BSD, Mac and Windows. The best replxx alternative is Python Prompt Toolkit, which is both free and Open Source. Other great apps like replxx are GNU Readline, libedit and Linenoise.
Cross-platform library for developing advanced CLI apps using syntax highlighting, multi-line editing, Emacs and Vi bindings, code completion, mouse support, Unicode compatibility, and auto suggestions, with minimal dependencies and extensive configuration options.
Provides advanced line-editing, tab-completion, history management, cursor movement, search, kill ring features, programmable input, multi-mode editing, word erasure, undo support, and configuration via inputrc to enhance interactive command-line environments.
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