The 1.0 version of DownloadCheck 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 software lies within Security Tools, more precisely Personal Security.
This free software for Mac OS X was originally developed by Iconfactory. The most popular version of the application is 1.0. The application's installer is commonly called DownloadCheck_10.dmg. This program's bundle is identified as com.iconfactory.DownloadCheck. 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.
From the developer:
DownloadCheck is an application that checks for applications in your Downloads folder. It was written in response to the MP3Concept Trojan horse release of April 2004. See John Gruber's excellent commentary on this Trojan and the controversy/hype that it generated.
You may want to check out more Mac applications, such as TelnetLauncher or Tiptoe, which might be similar to DownloadCheck.