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 language
C++
License
GPL-2
Developer(s)
JACK development team

Recent releases:
JACK 1.9.19 15 Jul '21
JACK 1.9.18 14 Apr '21
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