Editing JACK Audio Connection Kit (section)

== Implementations ==
The JACK API is standardized by consensus, and two compatible implementations exist: jack1, which is implemented in plain C and has been in maintenance mode for a while, and jack2 (originally jackdmp), a re-implementation in C++ originally led by Stéphane Letz, which introduced multi-processor scalability and support for operating systems other than Linux.<ref>{{cite web|title=What's new in JACK2? - Linux Audio Conference 2009 paper by primary JACK2 author Stephane Letz|url=http://lad.linuxaudio.org/events/2009_cdm/Thursday/01_Letz/|archive-url=https://archive.today/20120709233707/http://lad.linuxaudio.org/events/2009_cdm/Thursday/01_Letz/|url-status=dead|archive-date=July 9, 2012|access-date=17 February 2010|publisher=linuxaudio.org}}</ref>

JACK can be used with [[ALSA (Linux)|ALSA]], [[PortAudio]], [[CoreAudio]], [[FFADO]] and [[Open Sound System|OSS]] as hardware [[Front and back ends|back-ends]]. Additionally, a dummy driver (useful if no sound output is desired, e.g. for offline rendering) and an Audio-over-UDP driver exist.  One or both implementations can run on [[Linux]], [[macOS]], [[Solaris (operating system)|Solaris]], [[Microsoft Windows|Windows]], [[iOS]], [[FreeBSD]], [[OpenBSD]] and [[NetBSD]].

The JACK API is also implemented by [[PipeWire]] for [[Backward compatibility|backwards compatibility]] as a complete drop-in replacement provider for JACK clients, mapping JACK API calls to equivalent PipeWire calls.<ref>{{cite web |title=JACK - Wiki - PipeWire/pipewire |url=https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/JACK |website=PipeWire on GitLab |access-date=11 February 2021}}</ref> If used as a replacement for ALSA and PulseAudio as well, it can unify the different sound servers and APIs that might be typically found on a machine, and allow better integration between different software. PipeWire also claims to add a number of features and fix a number of limitations compared to JACK.<ref>{{cite web |title=FAQ - Wiki - PipeWire/pipewire |url=https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/FAQ#is-pipewire-another-jack-implementation |website=PipeWire on GitLab |access-date=11 February 2021}}</ref> The use of PipeWire as the default implementation of JACK is the default on [[Fedora (operating system)|Fedora]] 34 and newer.<ref>{{cite web |last1=Larabel |first1=Michael |title=Fedora 34 Gets Sign-Off For Trying To Default To PipeWire For Audio Needs |url=https://www.phoronix.com/scan.php?page=news_item&px=Fedora-34-PipeWire-Attempt |website=Phoronix |publisher=Phoronix Media |access-date=11 February 2021}}</ref>