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

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

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

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

Doxx is a collection of shell-based tools for parsing, viewing, and converting word processing files. It provides a terminal user interface for reading and searching DOCX files without requiring external office software, functioning as both a terminal document viewer and a command line parser. The project distinguishes itself by offering a full TUI document reader with outline navigation and the ability to export document content and metadata into alternative formats such as Markdown, CSV, JSON, and plain text. The system covers a broad range of capabilities including document metadata analy

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

ccls is a language server providing code completion, navigation, and semantic analysis for C and C++ projects. It focuses on the indexing and navigation of C-family codebases, enabling users to trace function calls and class hierarchies within a text editor. The project is designed for large scale project indexing, employing parallel source scanning to process massive source trees. It maintains a global symbol index that supports incremental updates as files are saved to disk, ensuring cross-references and symbol lookups remain current. The server covers a range of static code analysis workf

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

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

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

Koala is a graphical user interface for managing the compilation, transpilation, and background monitoring of web asset preprocessors. It serves as a build tool that converts Less, Sass, and CoffeeScript files into browser-compatible CSS and JavaScript. The application features a visual interface for controlling the transformation process, removing the need for command line interaction. It integrates a background file monitor that automatically recompiles source files in real time as changes are detected on the local filesystem. The tool provides utilities for managing global and project-spe

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

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

ngbp is a web application build system and project bootstrapper designed to automate the initialization and delivery of web projects. It provides a framework for generating standardized directory structures and preconfigured tooling to establish a baseline for scalable applications. The system features a client-side template cache that converts HTML templates into JavaScript strings to reduce network requests. It also includes a development workflow automator that monitors file changes to trigger automatic linting, unit testing, and browser refreshing. The tool covers build orchestration thr

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

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.

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

This project is a declarative framework and domain-specific language for managing Emacs Lisp packages. It functions as a startup performance optimizer by grouping package installation, variable settings, and keybindings into single blocks to reduce initial boot time. The system distinguishes itself through a deferred loading framework that delays package execution until specific keys, hooks, or modes are triggered. It uses a macro-based declaration syntax to organize configuration and automate the generation of autoloads, ensuring packages are only loaded when they are actually required. The

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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

Cleaver is a developer-focused presentation creator and static HTML presentation framework. It functions as a markdown slideshow generator that converts structured plain text into formatted HTML outputs for browser display. The tool enables rapid slide deck iteration through a live-reloading workflow that monitors source files for changes. It supports custom presentation styling by injecting external CSS, applying visual themes, and allowing per-slide formatting overrides. The system includes capabilities for automated slide compilation, including the generation of author credits and metadat

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

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