Open-source parser software

2737 open-source libraries, tools and applications tagged parser, ranked by how closely parser is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.

2737 products, primary matches first, then adoption-weighted; health v2 shown.

Product	Health v2	Stars	Maturity
microsoft/markitdown MarkItDown is a lightweight Python utility that converts a wide range of file types—including PDFs, Office documents, images, audio, and ar…	84	188214	active
Graphify-Labs/graphify Graphify is a Python package and CLI that turns a codebase, its documentation, and data files into a local, queryable knowledge graph. It w…	78	126575	active
microsoft/TypeScript TypeScript is a superset of JavaScript that adds optional static types and compiles to clean JavaScript. It provides a compiler and languag…	91	111245	active
opendatalab/MinerU MinerU is a document parsing tool that converts PDFs, images, DOCX, PPTX, and XLSX files into machine-readable Markdown and JSON. It handle…	86	80546	active
colbymchenry/codegraph CodeGraph is a local-first tool that indexes any codebase into a queryable knowledge graph using Tree-sitter parsing, exposing it to AI cod…	83	73612	active
Protocol Buffers Protocol Buffers is Google's language‑neutral, platform‑neutral mechanism for defining structured data and generating efficient binary seri…	96	72067	active
Docling Docling is a Python SDK and CLI that parses a wide range of document formats into a unified representation. It also provides a service mode…	87	68703	active
hugohe3/ppt-master PPT Master is an open‑source Python CLI that uses large language models to turn documents, web pages or topics into fully editable PowerPoi…	84	62770	active
FuelLabs/sway Sway is a domain‑specific programming language and compiler for writing smart contracts on the Fuel blockchain. It provides a full toolchai…	97	61390	active
Lodash Lodash is a modern JavaScript utility library that provides a wide range of modular functions for working with arrays, objects, strings, an…	88	61287	active
ImHex ImHex is a free, open-source hex editor built for reverse engineers, programmers, and security researchers. It offers binary analysis featu…	83	54966	active
PDF.js PDF.js is an open‑source JavaScript library that parses and renders PDF files directly in the browser using HTML5. It provides a full‑featu…	95	53910	active
LlamaIndex LlamaIndex is an open‑source framework for building LLM‑powered applications that ingest, parse, and index documents. It provides tools for…	93	52325	active
chenglou/pretext Pretext is a pure JavaScript/TypeScript library that measures and lays out multiline text without touching the DOM. It works with Canvas, S…	60	50754	active
skylot/jadx JADX is a Dex to Java decompiler that produces readable Java source code from Android APK, dex, aar, aab, and zip files, available as both …	85	50675	active
nlohmann/json nlohmann/json is a header‑only C++ library that provides a simple, modern API for parsing, generating, and manipulating JSON data. It also …	66	50656	active
iamkun/dayjs Day.js is a minimalist JavaScript library for parsing, validating, manipulating, and displaying dates and times. It offers a Moment.js‑comp…	94	48661	active
abhigyanpatwari/GitNexus GitNexus is a client‑side code intelligence engine that builds an interactive knowledge graph of any codebase directly in the browser. It a…	84	47734	active
DeusData/codebase-memory-mcp codebase-memory-mcp is a high‑performance Model Context Protocol (MCP) server that indexes source code into a persistent knowledge graph. I…	83	46783	active
Pandoc Pandoc is a universal document converter that reads and writes a wide variety of markup formats. It is available as a command‑line tool and…	99	46615	active
Pandoc Pandoc is a universal markup converter written in Haskell, available as both a library and a command-line tool. It converts documents betwe…	99	46615	stable
JSON Crack JSON Crack is an open‑source web application that visualizes JSON, YAML, CSV and XML data as interactive graphs. It also provides formattin…	75	44482	active
Babel Babel is a JavaScript compiler that transforms modern ECMAScript code into backward‑compatible versions. It provides a rich plugin ecosyste…	99	44135	active
colinhacks/zod Zod is a TypeScript‑first schema validation library that provides runtime validation with static type inference. It lets you define schemas…	94	44076	active
llvm/llvm-project LLVM is a modular, reusable compiler and toolchain infrastructure that provides libraries, tools, and APIs for building compilers, optimize…	100	41132	active
datalab-to/marker Marker is an open‑source Python tool that converts PDFs and other document formats into markdown, JSON, HTML, and structured chunks. It sup…	89	40358	active
drawDB drawDB is a free, open‑source online database diagram editor that lets you design ER diagrams and generate SQL for many dialects. It runs i…	74	39908	active
Polars Polars is a high-performance DataFrame library written in Rust with bindings for Python, Node.js, R and more. It provides fast, lazy and ea…	92	39857	active
google/langextract LangExtract is a Python library that uses large language models to extract structured information from unstructured text. It provides preci…	85	38953	active
Servo Servo is a high-performance, parallel web browser engine written in Rust. It provides a modular, embeddable rendering stack with GPU accele…	99	38177	active
soxoj/maigret Maigret is a Python‑based command‑line tool that gathers public information about a person using only a username. It checks thousands of we…	97	38084	active
PDFMathTranslate/PDFMathTranslate PDFMathTranslate is a Python‑based tool that translates scientific PDF documents into multiple languages while preserving the original layo…	70	37623	active
markedjs/marked Marked is a JavaScript library that parses and compiles Markdown into HTML. It works in Node.js, browsers, and as a command‑line tool, and …	96	37176	active
doocs/leetcode A comprehensive repository of LeetCode, Offer, and interview question solutions implemented in many programming languages. It serves as a r…	67	36676	active
HanLP HanLP is a multilingual natural language processing library for Python, offering a wide range of NLP tasks such as tokenization, POS taggin…	77	36510	active
SheetJS SheetJS Community Edition is an open‑source JavaScript library for reading, writing, and manipulating spreadsheet files in many formats. It…	32	36347	active
SheetJS SheetJS Community Edition is a JavaScript library that reads, writes, and converts spreadsheet files (XLSX, XLS, CSV, ODS, and more) with a…	32	36347	stable
CyberChef CyberChef is a web-based tool that lets users perform a wide range of data manipulation tasks such as encoding, encryption, compression, ha…	98	36120	active
CyberChef CyberChef is a browser-based web application for performing a wide range of 'cyber' operations such as encryption, encoding, compression, h…	98	36120	active
jq jq is a lightweight, portable command-line tool for processing JSON data. It lets you slice, filter, map, and transform JSON with concise, …	82	35854	active
jq jq is a lightweight command-line JSON processor written in portable C with zero runtime dependencies. It lets users slice, filter, map, and…	82	35854	stable
virgiliojr94/book-to-skill book-to-skill is a Python CLI that transforms technical books and documents into Claude Code agent skills. It extracts content, converts it…	78	34574	active
SWC SWC (Speedy Web Compiler) is a high-performance TypeScript/JavaScript compiler written in Rust. It provides both a Rust library and JavaScr…	93	34210	active
SWC SWC (Speedy Web Compiler) is a super-fast TypeScript/JavaScript compiler written in Rust, usable as both a Rust library and a JavaScript pa…	93	34210	stable
spaCy spaCy is an industrial-strength natural language processing library for Python and Cython, featuring pretrained pipelines for 70+ languages…	97	33952	stable
delta Delta is a fast, syntax‑highlighting pager for Git, diff, grep, ripgrep and blame output. It replaces the default Git pager to provide colo…	99	32478	active
iOfficeAI/OfficeCLI OfficeCLI is a command‑line tool that lets AI agents read, edit, and automate Word, Excel, and PowerPoint files without needing Microsoft O…	78	32092	active
Nuclei Nuclei is a high‑performance, open‑source vulnerability scanner written in Go. It uses simple YAML‑based templates to detect security issue…	96	32091	active
DevToys-app/DevToys DevToys is a free, open‑source desktop application that bundles dozens of tiny utilities for developers, such as converters, encoders, form…	84	32074	active
tirth8205/code-review-graph code-review-graph is a Python library that builds a local, incremental knowledge graph of a codebase using Tree-sitter. It serves compact, …	79	31880	active
docsify Docsify is a magical documentation site generator that turns Markdown files into a live website without a build step. It runs in the browse…	84	31542	active
cheeriojs/cheerio Cheerio is a fast, flexible, and elegant library for parsing and manipulating HTML and XML in JavaScript. It provides a jQuery‑like API for…	81	30514	active
OpenDataLoader PDF OpenDataLoader PDF is an open‑source PDF parsing library that converts PDFs into AI‑ready formats such as Markdown, JSON with bounding boxe…	83	29741	active
OpenDataLoader PDF OpenDataLoader PDF is an open-source (Apache-2.0) PDF parser that converts PDFs into AI-ready Markdown, JSON with per-element bounding boxe…	83	29741	active
PostCSS PostCSS is a JavaScript library for parsing CSS into an abstract syntax tree and applying transformations via plugins. It enables linting, …	96	28975	active
PostCSS PostCSS is a JavaScript framework for transforming CSS via a plugin ecosystem, parsing stylesheets into an AST that plugins can analyze and…	96	28975	stable
Pydantic Pydantic is a Python library that validates and parses data using type hints. It provides fast, extensible schema validation and JSON‑Schem…	99	28972	active
yamadashy/repomix Repomix is a command‑line utility that bundles an entire source repository into a single, AI‑optimized file. It trims comments, compresses …	85	28674	active
srbhr/Resume-Matcher Resume Matcher is an AI‑powered application that helps you create, tailor, and export resumes and cover letters for specific job postings. …	87	28535	active
TruffleHog TruffleHog is an open‑source command‑line tool that discovers, classifies, verifies, and analyses leaked credentials across code repositori…	93	28212	active
alibaba/druid Alibaba Druid is a high‑performance Java database connection pool that also provides a powerful SQL parser and security firewall. It includ…	71	28170	active
ESLint ESLint is a pluggable JavaScript and TypeScript linter that statically analyzes code to find problems and enforce style. It can be run from…	100	27571	active
xiaojieonly/Ehviewer_CN_SXJ EhViewer is an Android application for browsing and downloading content from the E-Hentai gallery. It provides a mobile-friendly interface …	98	27320	active
Tree-sitter Tree-sitter is a parser generator and incremental parsing library written in C with Rust bindings. It builds concrete syntax trees for sour…	96	27097	active
Tree-sitter Tree-sitter is a parser generator tool and incremental parsing library that builds concrete syntax trees for source files and efficiently u…	96	27097	stable
ILSpy ILSpy is an open-source, cross‑platform .NET assembly browser and decompiler. It provides a graphical UI as well as command‑line tools for …	94	26677	active
google/flatbuffers FlatBuffers is Google's cross-platform, memory-efficient serialization library that stores data in a binary format you can read directly wi…	80	26561	stable
Wilfred/difftastic Difftastic is a structural diff CLI tool that compares files based on syntax parsed with tree-sitter, rather than line-by-line. It supports…	93	25966	active
Apktool Apktool is a Java‑based command‑line utility for reverse engineering Android APK files. It can decode resources, decompile dex code to smal…	90	25958	active
Apktool Apktool is a Java-based command-line tool for reverse engineering Android APK files. It decodes resources and manifest files to nearly orig…	90	25958	stable
D2 D2 is a modern declarative diagram scripting language that converts plain‑text definitions into visual diagrams. It provides a fast CLI, a …	92	25596	active
Highlight.js Highlight.js is a JavaScript library that adds syntax highlighting to code blocks in web pages and server‑side environments. It supports au…	89	25004	active
simdjson simdjson is a high‑performance C++ library for parsing JSON using SIMD instructions. It provides strict validation, minification and fast N…	100	24432	active
simdjson A C++ library that parses JSON at gigabytes-per-second speeds using SIMD instructions and microparallel algorithms, with runtime CPU-tailor…	100	24432	stable
guillaumemeyer/watermarks-remover watermarks-remover is a Python‑based service and agent skill that strips AI provenance watermarks from text and a wide range of file format…	78	24211	active
Mihon Mihon is a free, open‑source manga, webtoon and comic reader for Android. It offers a configurable UI, offline reading, library management …	88	23723	active
AZeC4/TelegramGroup A web service that aggregates and indexes over 10,000 Telegram groups, channels, and bots. It provides searchable listings and links to var…	76	23431	active
Oxc Oxc is a Rust‑based collection of high‑performance JavaScript and TypeScript tools, including a parser, linter, formatter, transformer, min…	95	23109	active
SwiftyJSON SwiftyJSON is a Swift library that simplifies parsing and manipulating JSON data with convenient subscript access and automatic optional ha…	63	22939	stable
firecrawl/anydoc A fast Rust library that converts Word, PowerPoint, Excel, OpenDocument, RTF, EPUB, CSV, and PDF documents into clean GitHub-Flavored Markd…	74	22812	active
facebook/flow Flow is a static type checker for JavaScript that adds optional type annotations to improve code safety and developer productivity. It is i…	95	22296	active
cat-catch Cat-Catch is an open‑source browser extension that lists and allows downloading of resources on the current page, including video streams. …	90	22129	active
huggingface/datasets 🤗 Datasets is a Python library that provides one‑line loading of thousands of public datasets and powerful tools for preprocessing and stre…	99	22061	active
markdown-it/markdown-it markdown-it is a fast, pluggable Markdown parser for JavaScript with 100% CommonMark support plus syntax extensions like URL autolinking an…	75	21930	stable
Pug Pug is a high-performance, feature-rich template engine for Node.js and browsers, heavily influenced by Haml, that compiles indentation-bas…	72	21838	stable
Guidance Guidance is a Python library that provides a domain‑specific language for steering large language models. It lets developers embed conditio…	73	21799	active
jsdom jsdom is a pure‑JavaScript implementation of the DOM, HTML, and related web standards for Node.js. It lets you create and manipulate a virt…	95	21716	active
jsdom jsdom is a pure-JavaScript implementation of web standards like the WHATWG DOM and HTML Standards for Node.js. It emulates enough of a web …	95	21716	active
Ciphey Ciphey is a command‑line utility (and library) that automatically detects and decodes encrypted or encoded text without needing the key or …	85	21662	active
Ciphey Ciphey is a Rust-based CLI tool and library that automatically decrypts encryptions without a known key or cipher, decodes encodings, and c…	85	21662	active
datalab-to/surya Surya is an open‑source OCR model that extracts text, layout structure and tables from scanned documents. It supports over 90 languages and…	87	21484	active
allinurl/goaccess GoAccess is an open‑source, real‑time web log analyzer that can display statistics in a terminal UI or a live HTML dashboard. It parses com…	77	21061	active
qax-os/excelize Excelize is a pure Go library for reading and writing Microsoft Excel spreadsheet files (XLSX, XLSM, XLAM, etc.). It provides high‑performa…	86	20999	active
.NET Compiler Platform (Roslyn) Roslyn is the open‑source .NET Compiler Platform that provides C# and Visual Basic compilers with rich code‑analysis APIs. It enables devel…	67	20723	active
.NET Compiler Platform (Roslyn) Roslyn is the open-source .NET Compiler Platform implementing the C# and Visual Basic compilers with rich code analysis APIs. It exposes co…	67	20723	stable
peass-ng/PEASS-ng PEASS-ng is a collection of privilege escalation scripts for Linux, Windows and macOS that enumerate system information and potential escal…	96	20681	active
fx fx is a terminal-based JSON viewer and processor written in Go. It provides an interactive TUI for exploring JSON and a powerful CLI for tr…	98	20647	active
res-downloader Res‑Downloader is a cross‑platform desktop GUI built with Go and Wails that captures network traffic and extracts downloadable media resour…	80	20510	active
Obtainium Obtainium is an Android application that checks for updates directly from source repositories and downloads the latest APKs. It supports ma…	95	20509	active
KaTeX/KaTeX KaTeX is a fast, dependency‑free JavaScript library that renders LaTeX math expressions as high‑quality HTML/CSS. It works in browsers and …	99	20461	active