properJavaRDP 1.1 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 software lies within Developer Tools, more precisely IDE. This free Mac app was originally designed by properJavaRDP Team. We recommend checking the downloaded files with any free antivirus.
From the developer:
properJavaRDP is an open source Java RDP client for Mac. It is based on rdesktop, a SourceForge project. properJavaRDP runs on Java 1.1 up (optimised for 1.4), and works on Linux, Windows and Mac. It also includes log4j-java1.1 The code in the repository does not represent a stable release and may not always compile.
You may want to check out more Mac applications, such as Objective Basic, Pleinpot or Epsilon, which might be related to properJavaRDP.