CNifti is a wrapper for the standard C NIfTI 1 library found at http://afni.nimh.nih.gov/pub/dist/src/nifti/

A ruby library that wraps libcogito

Extract dominant colors from images using native extension implemented in Rust.

Currently contains four options (ciede 76, cmclc, ciede94, and ciede2000) (all here: https://en.wikipedia.org/wiki/Color_difference), all weighted so that the distance between rgb 0,0,0 and rgb 255,255,255 will be 1.000 (accurate to 4 decimal places). Will add more. All are my own implementations...

Ruby bindings for Google's Compact Encoding Detection C++ library

Compix for oilypng

This is a Captcha gem for Rails Applications. It drawing captcha image with C code so it no dependencies.

Provides a class (CongruenceSolver) for finding the modular zeros of a polynomial (given the coefficients and modulus) and a binary (csolve) to to solve your congruences at the command line.

A string hash function that returns the same value each time it's called.

Simplification of convolver gem, FFTW removed, suitable only for smaller kernels. Convolver gem author is Neil Slater, slobo777@gmail.com, https://github.com/neilslater

Utilities for working with COBOL copybooks and file conversion.

CorFu, the Coderunner/Trinity Fusion Optimisation Framework allows the optimisation of fusion performance using first principles flux calculations via Trinity.

Compatibility implementation of Coverage.peek_result

Uses git and ruby coverage information to determine which tests to run from your test suite

cp2112 is a Ruby wrapper for shared library of CP2112, a USB(HID) i2c/SMBus bridge device, which is distributed by Silicon Laboratories.

see https://github.com/etm/opcua-smart

This gem contains C extension for calculating CRC32

Credo detector

A libcriu wrapper for CRuby

CAST parses C code into an abstract syntax tree (AST), lets you break it, then vomit it out as code. The parser does C99. This fork supports Ruby 1.9.3, gemspec, and requires Hoe. The Rubyforge page above is documentation for the original version, but most things should be the same.