Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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error-stack-parser
Cross-browser JavaScript library that parses Error objects into structured stack frames with function names, file paths, and line/column numbers.
tree-sitter-c-sharp
C# grammar for tree-sitter, based on the Roslyn language grammar
x509-parser
A pure-Rust, zero-copy X.509 certificate parser (RFC 5280) built on the nom parser-combinator framework, with optional signature verification.
tinycss2
Low-level CSS Syntax Level 3 parser and generator for Python
lark
A modern parsing toolkit for Python supporting Earley, LALR(1), and CYK parsers with automatic tree construction.
jsonparser
A fast, allocation-free JSON parser for Go that reads values by key path without unmarshaling into structs.
Device Detector
Universal PHP library for parsing user agents into browsers, OS, and device info
snarkdown
A dead-simple, dependency-free Markdown-to-HTML parser that weighs about 1kb gzipped.
url-parse
Small, dependency-light URL parser that works identically in Node.js and the browser.
MyST Parser
An extended CommonMark-compliant Markdown parser with first-class bridges to docutils and Sphinx.
Griffe
Extract signatures and structure from entire Python programs for API docs and breaking-change detection.
url-pattern
A tiny, dependency-free library for matching and generating URL-like string patterns without regex.
go-shellwords
A Go library that splits shell-style command-line strings into argument slices, honoring POSIX quoting, escaping, and substitution rules.
roxmltree
Parse XML into a fast, read-only tree in Rust with zero unsafe code and no dependencies.
tree-sitter-c
The official C grammar for the tree-sitter incremental parsing library
@iarna/toml
A fast, spec-compliant TOML parser and stringifier for Node.js with a familiar JSON-style interface.
accept-language-parser
Parse HTTP Accept-Language headers and pick the best matching locale
parse-diff
A fast, dependency-free unified diff parser that converts raw patch text into structured file, chunk, and line-change objects for JavaScript and TypeScript projects.
Parsedown
Fast, single-class Markdown parser for PHP with no dependencies beyond mbstring.
Participle
A dead-simple Go library for building parsers straight from annotated struct tags.
ipywidgets
Interactive HTML widgets for Jupyter notebooks
whatlang
Fast, lightweight natural language and script detection for Rust
ojg
A high-performance JSON parser and toolkit for Go with a full JSONPath implementation.
libopenapi
A high-performance Go library for parsing, validating, mutating, bundling, and diffing OpenAPI 3.2/3.1/3.0, Swagger, Overlay, and Arazzo documents.
