Essential Control

• KXStudio cadence  – Master setup and control for Jack2, includes bundled utilities for patchbay, monitoring and session control
• qJackctl  –  Alternative setup and control for Jack2 and patchbay configuration.  Compatible with Cadence, this version has a much better user interface and has provision for saving patchbay setups.
• jack_connect – connect a single patch at command line or in a script
• jack_disconnect – disconnect a single patch at command line or in a script

Patchbay

• KXStudio catia – Graphical patchbay – easy to use attractive and includes troubleshooting aids, but does not have a backup restore function
• Patchage – Graphical patchbay
• Patchmatrix – A different take on a patchbay with switching and gain control – midi and osc interface
• JackSanity – a command line patchbay and transport configuration control for Jack (I have not checked this one out)

Mixers and Monitor Control

• Non-Mixer – Incredibly flexible, Midi controlled extensible mixer for Jack.  Each mixer strip is independent and groupable.  Hosts audio plugins and interfaces with Non-Session control.
• zita-mu1 –  four input monitor control / PPM / Talkback application

Interconnection and monitoring

• zita-njbridge – send audio from one computer to another on a local area network.  Bridges are one way, but have any number of channels. There can be many instances of zita-njbridge running at once for bidirectional audio.
• netjack2 – built in jack network connector.  Hub and spoke system with master and slave.  Slaves lose their ALSA connection, which can be restored with  zita-ajbridge.
• zita-ajbridge – connect any ALSA device into Jack  (Jack natively connects to only a single sound card)  This also resolves sound card clock issues.
• ebumeter – Metering according to EBU R-128
• meterbridge – Selectable types of sound level meters, stackable
• silentjack – Execute a program on silence
• jaaa – (JACK and ALSA Audio Analyser, is an audio signal generator and spectrum analyser designed to make accurate measurements.
• openob – Can also be used on local networks for high quality two channel connections between computers.

Media Players

• vlc – the computer audio-video “jack” of all trades.  The biggest problem with vlc is that it has a million settings.  It can play files, streams, playlists, etc.  It can deliver them to jack, to icecast or shoutcast as a client, it can make rtsp:// streams.  You need to read 50 pages of man file to understand how to do exactlly what you want.
• madjack – a file player that could be looked at as a virtual cart machine.  Has OSC controls so you can run it from an cellphone or tablet wirelessly using an OSC app like

Streamers and Internet Remote Sources

• B.U.T.T –  Icecast / Shoutcast Streamer Recorder
• openob – Audio Studio Transmitter Link / Remote Broadcast tool