Open-source alternatives to Runestone

TagSpaces is an offline-first file tagging and organization platform that lets you manage local files with portable metadata stored directly in filenames or sidecar JSON files, eliminating the need for a central database. It functions as a full-text file search engine, a Kanban board file organizer, a local AI file assistant, an S3-compatible cloud file manager, and a web clipper and bookmark manager, all within a single application. The project distinguishes itself through a local-first architecture where all file operations, indexing, and AI processing run entirely on the device, with cloud

MacVim is a native graphical interface for the Vim text editor tailored for the macOS desktop environment. It is a modal, keyboard-driven editor that wraps a command-line core within a native Cocoa-based GUI wrapper, providing system menus, toolbars, and scroll bars. The editor is highly scriptable, utilizing a built-in scripting language and external interpreters for Python, Ruby, and Perl to automate complex text workflows. It further extends functionality by connecting to third-party applications through asynchronous jobs and communication channels. The project includes capabilities for s

AstroNvim is a modular Neovim distribution that functions as a comprehensive development environment. It provides a pre-configured framework for managing editor settings, plugin ecosystems, and language server integrations, effectively transforming a base text editor into a full-featured integrated development environment. The project distinguishes itself through a highly customizable Lua-based architecture that emphasizes modularity and performance. It enables users to manage complex editor configurations through a centralized, declarative system that supports lazy loading, community-maintai

CodeMirror is a browser-based code editor and extensible text editor framework. It functions as a programmable interface for rendering code and text with support for numerous programming languages, serving as a reusable component for web-based integrated development environments. The project provides a syntax highlighting engine that applies visual styles to text based on programming language rules. It includes a programming API and a CSS theming system to customize the editor's appearance and extend its functionality with custom behaviors. The framework covers capabilities for embedding tex

Ace is a high-performance, browser-based code editor and JavaScript text editor component designed to be embedded into web applications. It functions as a feature-rich alternative to standard text areas, providing a syntax highlighting engine and support for multiple programming and markup languages. The editor is distinguished by its ability to handle large documents containing millions of lines while maintaining stable performance. It supports multi-cursor editing, allowing simultaneous modifications at multiple selection points across a document. The project covers a broad range of develo

monaco-react is a React component wrapper for the Monaco Editor, providing a declarative way to embed a browser-based text editor into web applications. It includes components for standard code editing with syntax highlighting and a specialized diff editor for side-by-side version comparison. The project enables the integration of syntax validation to flag errors and provides mechanisms for managing multiple files through unique model identifiers, which preserve undo history and selection states during switches. It allows for custom asset loading via CDN or local paths and provides access to

KodExplorer is a web-based file manager and remote server administration tool that provides a desktop-like interface for organizing and managing files in a browser. It functions as an enterprise file sharing platform and an online document previewer, allowing users to view hundreds of file formats without local software installations. The system is distinguished by a plugin-based API gateway that exposes RESTful endpoints for third-party integrations and custom functional extensions. It also includes a browser-based code editor with syntax highlighting and autocomplete for over 120 languages,

react-ace is a React component wrapper for the Ace code editor, designed to embed feature-rich text editing and syntax highlighting into web applications. It provides a browser-based editor that applies language-specific coloring and formatting rules to source code and markup files. The project distinguishes itself through support for specialized keyboard interaction modes, including Vim and Emacs, as well as a side-by-side diff viewer for comparing different file versions. It also functions as a tool for code snippets and live autocompletions to accelerate text entry. The component covers a

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

vim.js is a professional modal text editor implementation designed for integration into web browsers and JavaScript-based applications. It emulates a Vim environment by providing modal editing workflows, keyboard shortcuts, and a state-machine-based input handler to toggle between command and insertion modes. The project enables the embedding of a full-featured text editor into host applications. It facilitates browser-based development by replicating the logic and memory management of a native text editor using JavaScript objects and functions. The editor includes capabilities for syntax hi

Notepad4 is a lightweight, native Windows text editor built on the Scintilla editing component and rendered through the Win32 API. It is designed as a direct replacement for the default Windows Notepad, offering a faster, feature-rich editing experience with system-level integration such as Explorer context menu registration, taskbar jump list support, and the ability to intercept system notepad requests. The editor distinguishes itself with a context-sensitive completion engine that filters suggestions based on preceding punctuation and document content, alongside CPU-optimized encoding dete

Micro is an extensible terminal text editor that supports mouse interaction and intuitive keyboard shortcuts for editing files in a command line environment. It functions as a multi-cursor editor with syntax highlighting and a plugin system for adding custom functionality and automation scripts. The editor distinguishes itself through simultaneous editing across multiple cursors and a script-based extension system. It enables the automation of repetitive editing tasks via macro recording and playback of keystroke sequences. The project covers workspace management through split-screen panes a

Tiny File Manager is a single-script PHP file manager that provides a complete web-based interface for browsing, uploading, editing, and managing files and folders on a server. All functionality is contained in one PHP file with no external dependencies beyond the web server, using constant-based configuration and session authentication for access control. The file manager distinguishes itself through a built-in browser-based code editor with syntax highlighting for over 150 programming languages, an embedded document preview proxy that displays office documents and PDFs through Google or Mic

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

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

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

This repository contains a collection of extensions and configurations for a text editor plugin ecosystem. It provides a framework for adding language support and custom behavior through a system of customizable key bindings, a project indexing engine, and a syntax highlighting framework. The project utilizes a Python API to enable the development of custom plugins, menus, and tools. It supports a functional extension framework where users can create custom themes, syntax definitions, and resource overrides to expand the editor's visual styles and capabilities. The system covers advanced tex

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

Apkstudio is a reverse engineering integrated development environment designed for decompiling, modifying, and recompiling Android application packages. It provides a specialized suite for transforming binary files into readable source code and bundling them back into installable application archives. The project features a framework integration system that imports manufacturer-specific files to ensure accurate decompilation of vendor-modified applications. It includes a dedicated editor for Smali, Java, and XML files with syntax highlighting, as well as a hex editor for the direct modificati

Vditor is a browser-based Markdown editor and rendering engine that supports multiple editing interfaces, including a visual rich-text experience, instant rendering, and a traditional side-by-side split-view preview. It serves as an authoring tool for technical documentation and a component for web-based editor integration. The project is distinguished by its support for complex technical content, utilizing specialized rendering for mathematical formulas, flowcharts, sequence diagrams, and mind maps. It also functions as a collaborative document review tool, enabling users to attach anchored

Shiki is a syntax highlighting engine that generates color-coded HTML or ANSI output from source code. It functions as a static code highlighter, utilizing standard grammar definitions to parse text and apply accurate visual styling for documentation and terminal displays. The engine distinguishes itself by using a TextMate grammar parser to interpret text patterns, ensuring that code displays match the visual appearance of professional editors. It operates through an isomorphic runtime that supports both browser and server environments, utilizing WebAssembly for consistent execution and pre-

todo-comments.nvim is a Neovim plugin and codebase task navigator that highlights and manages task keywords within code comments. It functions as a Lua-based highlighter and workflow extension that aggregates pending work and notes from source code into a searchable project list. The plugin provides visual tracking of task comments using custom syntax highlighting and allows for jumping between these markers within a file. It enables project-wide task management by searching for tagged comments across multiple files to organize a development roadmap.

PSReadLine is a command line editor for PowerShell that provides advanced line editing and command history management. It functions as a suite of tools for enhancing the interactive shell experience through a Bash-inspired implementation of editing, completion, mapping, synchronization, and highlighting. The project includes an interactive completion engine for navigating suggestions via a menu system and a keyboard mapping tool for assigning shortcuts to custom actions. It also features a session history synchronizer that automatically saves and shares command history across multiple active

nvim-autopairs is a Lua-based extension for Neovim that automatically inserts closing brackets, quotes, and keywords to maintain balanced syntax. It functions as a contextual bracket automator, utilizing Tree-Sitter structural nodes to determine when to insert or skip closing characters based on the code's actual syntax tree. The plugin distinguishes itself by using Tree-Sitter awareness to prevent inserting pairs inside strings or comments. It supports dynamic closing string resolution and custom pairing logic, allowing users to define specific rules using regular expressions and filetype fi

Vim-galore is a comprehensive technical reference and curated guide for mastering the Vim text editor. It serves as a central resource for users seeking to understand the philosophy, command structure, and advanced customization capabilities required to operate professional-grade modal text editors effectively. The project distinguishes itself by providing a deep dive into efficient editing workflows, plugin management, and automation strategies within a terminal-based environment. It covers the full spectrum of editor mastery, from fundamental modal navigation and text manipulation to comple

Lite is a scriptable plain text editor and programmable editing environment written in Lua. It provides a minimalist interface for opening, modifying, and saving plain text documents. The editor is designed for extensibility, allowing users to define custom commands and behaviors through external Lua script modules. It supports a plugin system where new features are integrated by placing modules in designated directories for automatic loading at startup. The project covers a range of customization capabilities, including personalized keyboard shortcut mapping and visual theme overrides for c

This project is a functional programming compiler and JavaScript transpiler that transforms a statically typed language into optimized JavaScript for web browsers. It serves as a frontend architecture framework, providing a static type system and a package manager that enforces semantic versioning. The compiler uses a type-checking engine with automatic type inference to prevent runtime errors and guide code refactoring. It implements a structural pattern for managing application state and rendering user interfaces through a virtual DOM, utilizing immutable data and purity-based state transit