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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markdown-it-py
A CommonMark-compliant Markdown parser for Python, ported from the JS markdown-it
node-html-parser
A very fast HTML parser that builds a lightweight DOM tree with full CSS3 selector support.
croniter
Parses cron schedule strings and iterates the matching datetime values, with DST, second/year fields, and last-weekday support.
FastMCP
The fast, Pythonic framework for building Model Context Protocol servers, clients, and apps
Pydantic AI
A type-safe Python agent framework built by the Pydantic team
networkx
Python library for creating, manipulating, and analyzing complex networks and graphs.
mathjs
Extensive math library for JavaScript and Node.js with big numbers, complex numbers, units, and matrices.
jsoniter
A high-performance, 100% compatible drop-in replacement for Go's encoding/json.
structlog
Structured, typed logging for Python built on plain functions and dictionaries instead of a bespoke logging DSL.
@apidevtools/swagger-parser
Parses, validates, and dereferences Swagger 2.0 and OpenAPI 3.x specs in Node.js and browsers
@xmldom/xmldom
A pure JavaScript, W3C-standard DOMParser and XMLSerializer for parsing and building XML/HTML documents
prometheus-client
The official Python instrumentation library for exposing Prometheus metrics
Slack SDK for Python
The official Python SDK for building apps, bots, and integrations on the Slack Platform.
colord
A tiny, dependency-free TypeScript library for parsing, converting, and manipulating colors in any format.
node-sql-parser
Parses SQL statements into an AST and converts them back to SQL across a dozen database dialects.
clickhouse-connect
ClickHouse's official high-performance Python driver, with native Pandas, NumPy, PyArrow, and Superset support
sniffio
A tiny Python library that detects which async framework (trio, asyncio, or curio) your code is currently running under.
E2B
Python SDK for spinning up secure, isolated cloud sandboxes where AI agents can safely run code.
PyMuPDF
A high-performance Python library for extracting, rendering, converting, and manipulating PDF and other document formats.
APScheduler
Python task scheduler with cron, interval, and one-off triggers, backed by pluggable persistent datastores for distributed job scheduling.
opencv-python
Pre-built, pip-installable OpenCV bindings that give Python programs full computer vision and image-processing capabilities without compiling from source.
@e2b/code-interpreter
JavaScript/TypeScript SDK for running AI-generated code in stateful, isolated E2B cloud sandboxes
tree-sitter-typescript
TypeScript and TSX grammars for the tree-sitter incremental parsing framework.
PEFT
Hugging Face's library of state-of-the-art parameter-efficient fine-tuning methods for large models.
