PKCS#7Viewer 1.0.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program is included in Developer Tools. This free software for Mac OS X is an intellectual property of Gen Kiyooka.
The software can also be called "PKCS7Viewer". The most popular version among the application users is 1.0. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. PKCS#7Viewer was developed to work on Mac OS X 10.6.8 or later.
From the developer:
Finally, a graphical tool for inspecting ASN.1 parse trees aka App Store Receipts and codesign/SSL certificates encoded in the ASN.1 DER/BER format. Use alone or in conjunction with Tighten Pro code generator.
Aimed primarily at Cocoa developers writing and testing code for In-App Purchase Receipt validation, PKCS#7Viewer can open and inspect almost any PKCS ASN.1 DER/BER encoded container.
You may want to check out more Mac applications, such as ZendStudio, PHP Code Tester or Library Inspector, which might be related to PKCS#7Viewer.