MIDI Events is a library for creating MIDI Event Messages that can be sent to MIDI Instruments through other libraries such as midi-communications or unimidi

MIDI Parser is a library for parsing MIDI Event Messages received from any MIDI device through other libraries such as midi-communications or unimidi

Real-time and offline ruck shredulers for MIDI using midiator and midilib.

MidiSmtpServer is the highly customizable ruby SMTP-Server and SMTP-Service library with builtin support for AUTH and SSL/STARTTLS, 8BITMIME and SMTPUTF8, IPv4 and IPv6 and additional features.

midilib is a pure Ruby MIDI library useful for reading and writing standard MIDI files and manipulating MIDI event data.

A nice Ruby interface to your system's MIDI services. MIDIator was inspired by Topher Cyll's fantastic Practical Ruby Projects book. In it, Topher describes how to interact with the MIDI providers in OSX, Linux, and Windows. As I was reading the book, I noticed some things I would do different...

Process realtime MIDI input with Ruby.

Realtime MIDI IO with JRuby using the javax.sound.midi API

Objects and classes for dealing with MIDI messages.

A utility for parsing MIDI messages from various types of input

Realtime MIDI IO with Ruby in Windows/Cygwin using the WinMM system API

A tempo source that is capable of synchronizing with MIDI clocks.

Perform MIDI Machine Control (MMC).

Access the Apple Core MIDI framework API with Ruby.

Process MIDI messages in Ruby

Core MIDI instrument functionality in Ruby

MIDIOps is to automate some works with MIDI events

Access MIDI devices for MacOS, Linux (wip), Windows (wip) and JRuby (wip).

pretty cat/tailf-like command for midi inputs

Ruby MIDI DJing/live-coding thing