Similar to Ruby

GRASS GIS

Gretl

GROMACS

GStreamer

GThumb

GTK

H2O (web server)

HHVM

HTML Tidy

Htop

HTTrack

I3 (window manager)

Intelligent Input Bus

Illumos

Interactive Ruby Shell

IPodLinux

Iptables

Irssi

Kernel-based Virtual Machine

Zlib

1349 (band)

List of Japanese inventions and discoveries

1:35 scale

5 nm process

Blu-ray

Broadcast Markup Language

Boss DS-1

Camellia (cipher)