libopenmpt is a library to render tracker music (MOD, XM, S3M, IT, MPTM and dozens of other legacy formats) to a PCM audio stream. See https://openmpt.org/ for more information.

passwdqc, a password quality checker

Minimalistic Ruby FFI bindings for using a "Cryptoki" (PKCS11) library.

FFI wrapper for procps library

radix tree implementation in c++ with FFI bindings

OpenSSL/RC4 through FFI

A low-level Ruby FFI wrapper for libexif.

A low-level Ruby FFI wrapper for libexiv2.

Ruby FFI bindings for Crossroads I/O messaging library.

Ruby Serial port library that uses Ruby standard library IO to open a connection to a serial port. Then configures the port using FFI

Access to Siemens PLCs, Simulation of Siemens PLCs

FFI bindings for the ssdeep library "libfuzzy" for fuzzy hash comparisons

Ruby FFI bindings for stat

A module to add extra functionalities to FFI::Struct

Ruby/FFI bindings for Sybase's Open Client library.

Ruby FFI bindings to Tox

ffi-udis86 provides Ruby FFI bindings for the udis86, a x86 and x86-64 disassembler.

FFI Wrapper for libuuid with extra helpers for common UUID tasks like getting an array of uuids for quicker distribution

Allow passing ruby values instead of void* pointers.

An FFI wrapper for the vJoy virtual controller software.