Download of Aporia 0.4.1 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. This free software for Mac OS X is an intellectual property of nim-lang. The program lies within Developer Tools, more precisely Debugging Tools.
From the developer:
Aporia is an IDE for the Nim programming language. This application uses GTK as the default toolkit, and the GT source view for the text editor component. To compile Aporia you need the latest version of the nim compiler, preferably the unstable release from Github.
You may want to check out more software for Mac, such as BugReporter, CoreAnimationKioskMenu or QCCoreAnimationKioskStyleMenu, which might be similar to Aporia.