Robbing the buried Refinements from ObjectSpace

Remind is a calendar program with a real expression language behind it: a Hebrew calendar, moon phases, sunrise and sunset, and date arithmetic that knows about weekdays, holidays and OMITted days. All of it is C, and all of it is reachable. remind-rb builds Remind's own sources into a shared library and binds them with Fiddle, so `moonphase(today())` and `sunrise('2027-06-21')` are Ruby calls rather than a shell-out and a parse of the output. Dates come back as Date objects, times as minutes, strings as strings. The Remind sources are vendored beside the gem, so the library binds the version it was built against rather than whatever is on the PATH.

Complete class-based reVault lockbox and vault API

Control a Raspberry Pi's hardware from Ruby. GPIO goes through libgpiod v2 — the Linux GPIO character device (uAPI v2) — rather than the deprecated sysfs interface. PWM is either the hardware peripheral through sysfs or timed in Ruby on any line; I2C and SPI are ioctl calls on /dev/i2c-N and /dev/spidev, needing no libgpiod at all. On top sits a gpiozero-style device layer: LED, Button, Motor, PWMLED, RGBLED, Servo, RotaryEncoder, and drivers for the ADT7410 temperature sensor, ST7032 character LCD, MCP3208 ADC, ILI9341 colour TFT and XPT2046 touch panel. Bound through the stdlib `fiddle`, which is built with the interpreter and so matches any Pi's architecture, unlike the precompiled `ffi` gem.

rjq implements a practical jq 1.7.1-compatible subset with a command line and Ruby API.

Just the bare minimum of what's needed to create bi-directional chat bots using Roda as backend, sucker_punch and Clockwork for async and timed jobs.

Ergonomic ptrace bindings for building debuggers, tracers, and strace-like tools in Ruby.

A CI-friendly RSpec formatter that keeps test progress readable when examples write logs.

Polyglot AI coding agent with spatiotemporal composability, file buffering, and automated repair.

A Ruby game engine using OpenGL and GLFW

Ruby CaDes bindings

rush implements the POSIX.1-2017 Shell Command Language (IEEE Std 1003.1 §2) in pure Ruby, verified differentially against dash.

Fail-closed native process sandboxing for Ruby

SCS - the splitting conic solver - for Ruby

Builds seccomp cBPF filters and supervises Linux syscalls through SECCOMP_RET_USER_NOTIF without native extensions.

Ruby bindings for Shojiku, a document engine for invoices, receipts and slips. A YAML template plus JSON or YAML params in, a deterministic PDF out, with signing and verification over the result. The layout engine is a shared C library loaded through fiddle, so the same params produce the same bytes here as in the CLI and every other Shojiku SDK.

Official Sidemail.io Ruby library providing convenient access to the Sidemail API.

A DSL and command line tool to describe and run automated tests

An SQA-specific Fiddle binding directly against the installed TA-Lib C library, providing many technical analysis indicators for stock analysis. Part of the SQA (Simple Qualitative Analysis) ecosystem.

A Unix shell written in Ruby with a structured scripting language for shell programs.