Open-source alternatives to Sioyek

Embed PDF Viewer is a browser-based PDF rendering library that uses a WebAssembly port of the PDFium engine to display documents entirely on the client side, with no server-side processing required. It provides a framework-agnostic core engine layer that manages the PDF document lifecycle, memory allocation, and WebAssembly resource cleanup, with dedicated integration hooks for React and Vue 3 that handle initialization, document loading, and reactive state management. The library offers both a pre-built, embeddable viewer that can be inserted into any web page with a single initialization ca

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

A responsive Material Design theme for static blogs built with the Hexo framework. It functions as a comprehensive layout system that transforms markdown files into styled HTML pages, providing a specialized environment for technical documentation and personal blogging. The theme is characterized by a data-driven approach to content visualization, using radar charts for categories and word clouds for tags to represent post metadata. It further distinguishes its organization by utilizing a chronological timeline architecture for blog archives. The project covers a wide range of technical publ

SumatraPDF is a lightweight, multi-format document viewer designed for rendering PDF, eBook, and comic book files within a unified interface. It functions as both a graphical reading environment and a command-line document processor, enabling users to automate file conversion, merging, and extraction tasks without requiring a graphical interface. The application distinguishes itself through a single-executable binary distribution that utilizes direct-to-GDI rendering and memory-mapped file access to maintain high performance and minimal memory overhead. Users can personalize their workspace b

Reader is a digital content reader and browser-based document viewer. It functions as a digital library manager and content aggregator that collects articles and documents from various online sources into a single interface. The project utilizes a JSON-driven approach to organize and display hierarchies of digital documents. It incorporates a REST-based aggregation model to fetch reading materials and metadata from remote servers for a unified viewing experience. The application provides client-side rendering for digital texts and manages personal collections through a digital library system

Cimoc is a manga reader application and cross-platform ebook viewer designed for reading digital comics and image-based documents. It functions as both an online content aggregator and an offline media library, supporting the display of media from local files and remote web sources. The application integrates various web providers through a custom parser system to fetch and display online content. It includes a synchronization system to save application settings and reading progress to a remote server, maintaining consistency across different devices. Users can customize their reading experi

MarkEdit is a high-performance Markdown text editor and document navigator. It provides a scriptable editing environment that supports side-by-side HTML rendering for real-time formatting previews. The editor is distinguished by a multi-caret engine that enables rectangular block selections and simultaneous modification of multiple text ranges. It allows for extensive interface and functional customization through external CSS stylesheets and the integration of system-level scripts to automate repetitive tasks. The application includes tools for managing large documents, such as content bloc

kkFileView is a Spring Boot-based file preview server that provides a universal document viewer for rendering office files, PDFs, images, and 3D models directly in a web browser. It functions as a secure document rendering service that allows users to view a wide variety of file formats without requiring local software installations. The project distinguishes itself through specialized CAD to SVG conversion, transforming complex drawings into web-compatible formats. It includes a RESTful file preview API that allows these rendering capabilities to be integrated into external business applicat

vue-office is an office document preview library and web-based document viewer designed to render Word, Excel, PowerPoint, and PDF files directly in a web browser. It provides a collection of reusable components that allow for the display of documents using network URLs, data buffers, or blob data without requiring external plugins. This rendering solution is built as a cross-framework document renderer, offering integration for Vue 2, Vue 3, and React. It enables client-side document display to avoid server-side conversion processes. The library handles document visualization through client

This project is a centralized, community-driven repository of hands-on tutorials designed to facilitate skill acquisition through the practical construction of real-world software applications. It serves as a comprehensive directory that aggregates external documentation and instructional materials, providing a structured path for developers to master specific programming languages and technical domains. The repository distinguishes itself by organizing disparate technical resources into a hierarchical, taxonomy-based structure that enables developers to discover and navigate diverse software

Slap is a terminal-based text editor designed to mimic the user experience and interface of a graphical code editor within a command-line environment. It functions as both a text editor and a text-user interface file manager, providing a navigable sidebar for organizing and switching between files and directories. The editor is built for extensibility through a plugin system that allows the loading of external scripts and packages to add new features and core functionality. Users can customize the editor workflow by remapping keyboard shortcuts, adjusting performance parameters, and modifying

Readest is a cross-platform digital book reader and library management system designed to render multi-format ebook files across different devices. It provides a consistent interface for viewing digital content while coordinating reading progress, bookmarks, and notes through synchronization services. The application includes specialized tools for technical and academic reading, such as code syntax highlighting, a virtual split-screen viewport for comparing documents, and full-text search for rapid information retrieval. It further extends the reading experience with integrated dictionary loo

Spacemacs is a community-driven configuration for Emacs that integrates modal text editing and a modular system for managing editor features. It implements distinct states for navigation and insertion to separate text manipulation from text entry, combining the efficiency of modal navigation with the extensibility of the Emacs environment. The project distinguishes itself through a layer-based feature composition system, which groups related third-party packages and configurations into modular units. This system includes dependency-based resolution to manage conflicting extensions and a mnemo

pypdf is a Python library for parsing, manipulating, and generating PDF documents. It provides high-level operations for document processing, such as merging multiple files into one or splitting a single document into smaller files. The project includes specialized tools for managing interactive elements, including the creation and modification of annotations, hyperlinks, and form fields. It also supports advanced metadata management, allowing for the extraction and modification of standard document properties and XML-based XMP metadata. Beyond basic structural changes, the library covers pa

Bacon is a background job runner and text-based user interface test dashboard designed for tracking code health and isolating failing tests. It functions as a developer workflow automator and file system watcher that triggers shell commands and verification tasks automatically when source files are modified. The tool allows for the definition of custom checkers and keyboard shortcuts to accelerate the iteration and debugging process. It provides a focused display for monitoring project health by tracking compilation errors and restricting active jobs to only those tests that have failed. The

HyperCeiler is an Android system customizer and enhancement kit designed to alter core application logic and graphical interfaces. It functions as a customization module specifically for HyperOS mobile devices to modify their visual and functional behaviors. The project utilizes a system of signed OS modules, employing keystores and digital credentials to cryptographically sign packages for secure installation on the target device. Its capabilities cover the modification of system behavior and the alteration of visual elements through resource-based UI overrides and system-level logic modifi

webpack-dev-server is a local web server designed to serve webpack bundles and trigger browser refreshes when source files change. It functions as a development environment that hosts bundled applications and provides a live reloading workflow. The project distinguishes itself by supporting hot module replacement to update modules in a running application without a full page reload. It also acts as an HTTP proxy to redirect network request paths to different backends and provides history API fallbacks specifically for hosting single-page applications. The server includes capabilities for mon

This is a static site generator template designed for creating research portfolio websites. It separates content from presentation by using Markdown files to define project metadata and research assets, then generates all pages as plain HTML files at build time, requiring no server-side processing for delivery. The template provides a structured layout for showcasing research papers, preprints, and institutional affiliations, with built-in components for displaying and copying formatted BibTeX citations. It includes media carousel components for cycling through images and videos, inline PDF r

coc.nvim is a Node.js extension host and Language Server Protocol client that transforms Vim and Neovim into a full integrated development environment. It provides a framework for executing JavaScript and TypeScript plugins within a separate process to enable advanced IDE features without blocking the editor's main thread. The project is distinguished by its ability to host extensions and language servers through a centralized JSON configuration. It supports the installation and lifecycle management of third-party extensions from registries or local files, allowing users to customize language

LLMBook-zh.github.io is a static educational website that provides a self-paced curriculum for learning large language model fundamentals. The site offers structured courseware and downloadable PDF slide decks covering LLM architecture, training, alignment, and deployment. The course materials include dedicated sections on fine-tuning pre-trained language models, model alignment techniques, and prompt engineering strategies. All content is managed as Markdown files and compiled into a static site hosted on GitHub Pages, with an embedded PDF viewer for inline slide display and a custom 404 err

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ZY-Player is a cross-platform video player and media library manager designed for streaming video and live TV content from custom or imported source lists. It functions as a media metadata browser that fetches movie ratings and information from external databases to assist in content discovery. The application integrates with external player software by handing off media streams to third-party applications. It provides tools for organizing video resources through a media library manager that supports poster views and custom source list definitions. The system includes global media search to

LibreraReader is a multi-format e-book reader and digital library manager designed for mobile and desktop devices. It functions as a customizable document renderer and a text-to-speech document player that converts written text into spoken audio via a configurable speech engine and integrated media player. The project distinguishes itself through a high degree of visual and functional customization, including the ability to inject custom CSS for styling overrides and the use of pluggable rendering engines to balance speed and stability. It includes specialized navigation tools such as a verti

skhd is a hotkey daemon and keyboard remapper for macOS. It operates as a background service that maps custom keyboard shortcuts to shell commands, scripts, and system actions. The utility features application-aware shortcut management, allowing the same hotkey to execute different commands depending on which application is focused. It also includes an input mode manager to define distinct operational modes that change how keys behave based on the active state. The system supports contextual routing through application-specific shortcuts and event exclusions to preserve native app behavior.

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

crx-selection-translate is a multimodal translation browser extension designed to process text, images, PDFs, and audio-visual content. It provides a translation interface that operates across various digital formats, including a bilingual mode for web pages that displays translated content alongside the original text. The tool features a multi-engine comparison system that aggregates results from several translation services for selected text. It also includes an optical character recognition utility to extract and translate text from screenshots, clipboards, and image files. Additional cap

TheHive is a security incident response platform and multi-tenant case management system. It functions as a Security Orchestration, Automation, and Response (SOAR) tool and a threat intelligence platform designed to coordinate security investigations by managing alerts, cases, and observables. The platform is distinguished by its multi-tenant architecture, which isolates data across different organizations while supporting selective cross-tenant sharing. It features a SOAR automation engine capable of executing sandboxed JavaScript logic to automate workflows and trigger response actions thro