The 0.9.33 version of orDrumbox 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. The actual developer of this free Mac application is Philippe Reynaud.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The most popular version among the program users is 0.8. Ordrumbox-V0.8.05-src.zip is the common file name to indicate this application's installer. The software is included in Audio & Video Tools.
From the developer:
The orDrumbox is a software drum machine, designed to a creative pattern based way of drum programming with automatic music composition capabilities. You can compose beats even with polyrhythms, bass line and complete songs using included drum kits with the audio sequencer functions.
You may want to check out more Mac applications, such as M-Audio Key Rig, which might be similar to orDrumbox.