SQLProMSSQL 1.0.20 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. The actual developer of this software for Mac is Hankinsoft Development Inc. The program lies within Developer Tools, more precisely DB Tools.
From the developer:
SQLPro for MSSQL is a lightweight Microsoft SQL Server database client. The program allows for quick and simple access to MSSQL servers, including those hosted via cloud services such as SQL Azure or Amazon RDS. The tool offers support for executing multiple queries at once.
You may want to check out more software for Mac, such as OpdiTracker, Witango 6 or WitangoStudio, which might be related to SQLProMSSQL.