Download of WarrantyManager 3.5.1 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. The program is categorized as Productivity Tools. 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 Mac app was originally produced by @pps4Me.
From the developer:
Finally, the long search has come to the proof of purchase in case warranty is over - thanks WarrantyManager. WarrantyManager manages the warrantees of all your products. You can add anything to WarrantyManager and build you own inventory database. Products can be assigned to any of the categories, manufacturers and suppliers. You can add any document (receipt, warranty, product photo, email, etc.) to your product entry.
You may want to check out more Mac applications, such as PitStop Extreme, FileOpenInstaller or Blurb Tally, which might be similar to WarrantyManager.