Downloading AirSign 1.0.21 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. AirSign for Mac lies within Developer Tools, more precisely Distribution. 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 Mac app was originally created by AirSignapp.
From the developer:
AirSign lets you deliver your iOS app in a couple of minutes to your testers. The program allows you to prepare, re-sign, and deliver iOS apps in your cloud. Thanks to your Dropbox account or your S3 credentials, you can give to your testing team a QR code for over-the-air installation.
You may want to check out more software for Mac, such as Uploader Manager, SDMInst or SQLite Sorcerer, which might be related to AirSign.