Open-source alternatives to Code Prettify

zsh-syntax-highlighting is a Zsh shell extension and plugin that provides real-time syntax highlighting and visual feedback. It functions as an interactive command-line visual aid and regular expression text colorizer that distinguishes between commands, string literals, and shell constructs during input. The project allows for extensive customization through user-defined highlight rules, custom regular expression patterns, and predicate logic. It includes specific capabilities for path-based filtering and the assignment of custom colors to text segments. The system provides real-time comman

Prism is a JavaScript syntax highlighter and web-based code formatter. It functions as an extensible syntax engine designed to colorize and format code blocks on web pages, making various programming languages easier to read. The project processes raw code strings into styled HTML elements for use in frontend content rendering, technical documentation, and static site generation. It provides a modular system for adding custom language definitions and highlighting rules to a web-based code viewer.

Syntaxhighlighter is a JavaScript-based frontend library used to render readable source code on web pages. It functions as a client-side syntax highlighter that applies language-specific colors and formatting to plain text code blocks within a browser. The library allows for the generation of a minimal distribution of language brushes and visual themes tailored to specific project needs. This enables the creation of a custom build containing only the required scripts and stylesheets. The system handles source code highlighting for web-based documentation and supports custom asset bundling to

kanagawa.nvim is a Lua-based colorscheme for NeoVim that provides a high-contrast visual theme based on a traditional Japanese art color palette. It functions as a comprehensive styling system for the editor, applying semantic syntax highlighting to code structures and plugins. The project features a system for switching between different lighting variants, such as warm, deep dark, and light modes. It includes utilities for customizing specific palette colors and highlight groups, as well as the ability to export color definitions to external terminal emulators and shells for cross-applicatio

CodeMirror 5 is a browser-based code editor and extensible UI component. It functions as a syntax highlighting engine and a programmable text surface, providing a professional coding experience embedded within web pages. The project is distinguished by its ability to act as a collaborative text editor, synchronizing document changes across multiple users in real time. It also includes a dedicated Vim emulation layer that implements modal keyboard interactions, motions, and operators. The system covers broad capability areas including language support for autocompletion and error analysis, co

highlight.js is a JavaScript syntax highlighter and client-side code formatter that transforms plain text source code into highlighted HTML for web display. It provides syntax highlighting across a wide variety of programming languages. The library includes an automatic language detector that identifies the programming language of a code block to apply the correct highlighting rules without manual tagging. It is designed for web worker compatibility, allowing the highlighting process to run in background threads to prevent the browser interface from freezing during the processing of large vol

Crayon Syntax Highlighter is a web-based tool designed to render source code snippets with language-specific color formatting and styling. It functions as a content management plugin that enables the insertion, configuration, and visual customization of code blocks directly within web editors. The project distinguishes itself through its ability to fetch and display source code from external URLs, local files, or direct text input. It supports complex rendering requirements, such as mixed-language parsing and the isolation of specific code segments within a single document. Users can control

react-syntax-highlighter is a React component that renders source code with language-specific syntax coloring. It wraps the Prism and Highlight.js syntax highlighting libraries, tokenizing source code using their language grammars and mapping each token to a styled React element. The component operates in two styling modes: inline style objects applied directly to each token, or CSS class names that can be themed via external stylesheets. This dual-mode approach makes the highlighter portable across environments where CSS class injection may or may not be available. The component is built aro

Freeze is a code-to-image generator and terminal output renderer that converts source code and ANSI terminal text into high-quality images. It functions as a command-line tool that transforms text and styled sequences into scalable vector graphics for use in documentation and presentations. The tool differentiates itself by capturing raw output from shell commands via a pseudo-terminal environment and translating ANSI escape codes and colors directly into SVG styles. It features a terminal user interface for real-time parameter adjustment and supports configuration profiles to maintain consis

This project is a suite of specialized tools for the implementation of a language server, template parsing, and static type validation of single-file components. It provides a language server and a type checker to deliver consistent intelligence and validation for Vue components across different editors and command-line environments. The tooling utilizes a template parser to transform single-file component structures into virtual code, enabling static analysis and type checking on HTML-like structures. This process allows for the extraction of component metadata regarding props, events, and s

Highlight.js is a syntax highlighting library that automatically detects and applies color-coded styling to source code blocks within web pages. It functions as a language-agnostic formatting engine, utilizing a modular processor that applies consistent visual themes to diverse programming languages based on their specific grammatical rules. By decoupling the core parsing logic from language-specific definitions, the library provides a unified execution environment that operates without requiring internal knowledge of the target language. The project is distinguished by its modular architectu

This project is a responsive Jekyll blog theme and static site template designed as a technical blogging framework. It converts markdown content into a professional personal blog with integrated support for social profile management. The template is configured as a progressive web app, providing offline access and an app-like experience for visitors. It specifically caters to technical documentation by supporting the rendering of mathematical notation, formatted code snippets, and embedded presentations. The site includes capabilities for reader engagement through discussion system integrati

This project is a static site generator and documentation builder designed to transform markdown files into styled HTML documents. It functions as a programmatic conversion engine, allowing developers to integrate markdown processing and layout rendering directly into automated build scripts and content workflows. The tool distinguishes itself through a pipeline-oriented architecture that supports custom plugin integration and metadata-driven template injection. Users can define global or per-file metadata to dynamically populate page content, while the system’s template-based generation allo

The minimal amount of CSS to replicate the GitHub Markdown style

Codehike is a React-based documentation framework and interactive code walkthrough tool. It functions as a markdown content orchestrator that transforms decorated markdown into structured data and React components, serving as a visualization layer for highlighting code ranges, diffs, and compiler errors. The project is distinguished by its ability to create scrollycoding experiences and step-by-step technical tutorials. It features token-level animations that visually demonstrate how logic evolves between code versions and provides a system for syncing UI state to the browser scroll position.

Opentui is a terminal user interface framework for building interactive command line applications. It provides a component-based system featuring a flexbox layout engine, a virtual node component tree, and a low-level 2D cell array renderer. The project is distinguished by a sophisticated keyboard binding engine that maps complex multi-stroke sequences and chords to named commands using prioritized, reactive layers. It also implements a plugin architecture that allows external modules to inject custom UI components into designated layout slots and extend input logic at runtime. Its capabilit

Heynote is a markdown scratchpad editor and plain text note organizer that utilizes persistent, block-based buffers to maintain state across application sessions. It serves as a code snippet manager with automatic syntax highlighting and a tool for managing multiple categorized text buffers through a tabbed interface. The application functions as an interactive calculation notepad, evaluating mathematical expressions and currency conversions directly within the text. It also includes an image annotation utility that allows for freehand drawings and markups on embedded images, which can then b

Vis is a terminal-based modal text editor that utilizes vi keybindings and a system of structural regular expressions. It functions as a scriptable environment where Lua is used for configuration, custom key mappings, and plugin development. The editor distinguishes itself through a syntax highlighting system based on Parsing Expression Grammars and a pattern matching engine that treats text as a structure for complex search and replace operations. It also integrates directly with the system shell, allowing users to pipe text ranges to external commands and capture the resulting output. The

Astro Paper is a minimal and accessible blog theme for the Astro framework, designed to create SEO-optimized static websites. It serves as a pre-configured template for building personal blogs and technical portfolios that render content from Markdown and MDX files. The project distinguishes itself through specialized support for technical writing, including LaTeX mathematical equation rendering and code syntax highlighting. It also automates social media presence via the build-time generation of dynamic Open Graph images and social metadata. The framework covers a broad range of site manage

You-need-to-know-css is a curated library of pre-written CSS code snippets for common frontend styling tasks including layout patterns, visual effects, animations, and component styling. It serves as a quick reference for developers looking to implement ready-to-use styling solutions without writing CSS from scratch. The collection is organized by visual effect or layout category, with each snippet presented on a standalone page that includes syntax-highlighted code, property documentation explaining the CSS rules and their values, and a live inline demo rendered inside an isolated iframe to

PSReadLine is a command line editor, completion engine, history manager, and syntax highlighter for the PowerShell console. It provides a bash-inspired line editing experience that enables advanced cursor movement and text manipulation within the terminal. The project features a customizable input mapper for assigning keyboard shortcuts to specific actions and navigation logic. It includes a completion system that suggests matching commands through selectable menus or prefix-based matching. The tool covers real-time color coding for command text and error notifications to improve readability

This project is a Python terminal user interface library and toolkit designed for building interactive command-line applications. It provides a terminal input manager and a widget toolkit for rendering dashboards, menus, and editors within a terminal emulator. The library enables the creation of full-screen terminal interfaces and interactive shells. It distinguishes itself with advanced input handling, including lexer-based syntax highlighting for visual feedback on code structure and support for industry-standard keyboard navigation modes such as Emacs and Vi. The capability surface covers

Regexr is a web-based regular expression IDE designed for building, testing, and debugging patterns. It functions as a testing tool to validate expressions against sample text and a learning tool that provides an interactive guide and a built-in cheat sheet for studying syntax. The platform includes a community regex library, which is a searchable repository of user-contributed patterns. This enables the discovery, sharing, and reuse of proven matching logic through a public directory and collaborative sharing links. The tool supports real-time pattern construction with syntax highlighting a

VimTeX is an integrated development environment for authoring and compiling LaTeX documents within Vim and Neovim. It functions as a comprehensive suite for technical document authoring, combining the roles of a syntax highlighter, document navigator, and autocompletion engine. The plugin distinguishes itself through a coordinated workflow that manages asynchronous compilation and bidirectional synchronization with external PDF viewers. This allows users to jump between specific source locations and their rendered pages while maintaining a responsive editor interface during document productio

This project is a responsive Jekyll static site theme designed for technical blogs, documentation, and multilingual websites. It focuses on text readability and the presentation of technical content, providing a customizable CSS theme with multiple color palettes and dark mode toggling. The theme distinguishes itself through specialized rendering for technical assets, including mathematical formulas, diagrams, and syntax-highlighted code. It includes built-in internationalization support via translation keys to facilitate the creation of sites in multiple languages. The capability surface co

jless is an interactive JSON explorer and command-line viewer designed for reading and navigating hierarchical data structures within a terminal. It functions as a terminal JSON formatter that pretty-prints data from files or standard input, including support for newline-delimited formats. The tool serves as a JSON path extractor, allowing users to identify and copy the dot or bracket notation paths from the root to specific nodes. It also includes a regex search utility for locating specific keys and values within JSON datasets using full-text regular expressions. The application provides c

PHP-Console-Highlighter is a syntax highlighter and console code formatter designed to apply color-coding to PHP source code for display in terminal environments. It functions as a utility to transform plain PHP text into visually structured code for command line interfaces. The tool enables terminal-based code review and provides formatted output for PHP static analysis tools and command line applications. It uses regex-based tokenization and ANSI sequence color mapping to translate syntax tokens into colored text.