The 0.7 version of Jackbeat for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X is a product of Olivier Guilyardi. The software lies within Audio & Video Tools, more precisely Music Production.
From the developer:
Jackbeat is a free multi-platform audio sequencer for musicians and sound artists. The program provides a drummachine interface with animations for easy and playful editing. It is built for both composition and live setups. In addition, it supports ALSA, CoreAudio, PulseAudio, JACK, and ASIO.
You may want to check out more software for Mac, such as Mandala Virtual Brain, Bouncy or SmallScreen, which might be related to Jackbeat.