mBlock 3.4.11 for Mac can be downloaded from our website for free. This free software for Mac OS X is an intellectual property of Shenzhen Maker Works Technology Co., Ltd. The program lies within Developer Tools, more precisely General.
From the developer:
mBlock is a graphical programming environment based on Scratch 2.
You may want to check out more software for Mac, such as iWeb Action Pack, wxFormBuilder or TopCoder UML Tool, which might be related to mBlock.