JACK2 (JACK Audio Connection Kit) is a C++ low-latency audio server for multi-processor machines that allows JACK client programs to process and route audio and MIDI data in a synchronous, sample-accurate and low-latency manner. Originally written for the GNU/Linux operating system, it also runs on various Unix platforms, Mac OS X and MS Windows.

JACK differs from other audio servers in being designed from the ground up for professional audio work. It focuses on two key areas: synchronous execution of all clients, and low latency operation.

Software type
JACK
Utility
Library
Platform
GNU/Linux
Android
BSD
macOS
Windows
Software features
JACK Transport
MIDI
Modular
CV
Audio input
Software language
C++
License
GPL-2
Developer(s)
JACK development team

Recent releases:
JACK 1.9.17 15 Jan '21
JACK 1.9.16 16 Oct '20
JACK 1.9.15 15 Oct '20
JACK 1.9.14 19 Nov '19
JACK 1.9.13 6 Oct '19
JACK 1.9.12 13 Dec '17
JACK 1.9.11-RC1 13 Jun '17
JACK 1.9.11.RC1 13 Jun '17
JACK 1.9.11 13 Jun '17
JACK 1.9.10 20 Jul '14