Downloading Receigen 4.2.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This software is developed for Mac OS X 10.6 or later. This program's bundle is identified as com.etiemble.mac.Receigen.
The software lies within Developer Tools, more precisely IDE. The following versions: 2.2 and 1.6 are the most frequently downloaded ones by the program users. This Mac app was originally created by Laurent Etiemble. 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.
From the developer:
Receigen is a smart code generator for App Store receipt validation (both receipt and InApp purchase). The generated code is ready-to-integrate, pure C, fully debuggable and integrates various protection mechanisms to harden the reverse engineering. It also integrates nicely with Xcode for a streamlined build process.
You may want to check out more software for Mac, such as HexDecBin, wxFormBuilder or TopCoder UML Tool, which might be related to Receigen.