Kreuzberg is a high-performance document intelligence library with a Rust core and native Ruby bindings via Magnus. Extract text, metadata, and structured data from 75+ file formats including PDF, DOCX, PPTX, XLSX, HTML, RTF, images (with OCR), email, archives, and more. Features async/sync APIs, text chunking, language detection, and keyword extraction.

A fast, safe, extensible parser for CommonMark. This wraps the comrak Rust crate.

A suite of instrumentation metric primitives that can be exposed through a web services interface.

Markdown processing for GitLab Flavored Markdown

AutoCorrect is a linter and formatter to help you to improve copywriting, correct spaces, words, punctuations between CJK (Chinese, Japanese, Korean).

Captcha Gem for Rails, which generates captcha image by Rust.

High-performance JSON Schema validator with support for Draft 4, 6, 7, 2019-09, and 2020-12.

Blazingly fast DataFrames for Ruby

A gem to help engineering teams declare ownership of code

html-to-markdown is a native Ruby extension built on the shared Rust engine that powers the html-to-markdown project. It delivers identical HTML-to-Markdown output across languages, exposes inline image extraction, and ships with a CLI for automation workflows.

An unofficial Ruby wrapper for Tiktoken, a BPE tokenizer written by and used by OpenAI. It can be used to count the number of tokens in text before sending it to OpenAI APIs.

`css_inline` inlines CSS into HTML documents, using components from Mozilla's Servo project. This process is essential for sending HTML emails as you need to use "style" attributes instead of "style" tags.

Itsi Scheduler - A light-weight Fiber Scheduler implementation for Ruby

Itsi Server - A light-weight Rack Server implementation for Ruby

Fast state-of-the-art tokenizers for Ruby

Parquet is a high-performance Parquet library for Ruby, written in Rust. It wraps the official Apache Rust implementation to provide fast, correct Parquet parsing.

A Ruby binding for Wasmtime, a WebAssembly runtime.

Ruby gem for running state-of-the-art language models locally. Access LLMs, embeddings, rerankers, and NER models directly from Ruby using Rust-powered Candle with Metal/CUDA acceleration.

Ruby wrapper for MRML, the MJML parser implementation in Rust.

Ruby bindings for yrs. Yrs "wires" is a Rust port of the Yjs framework.