The actual developer of this free Mac application is Klink! Software. Dim3 for Mac belongs to Games. 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:
dim3 (was dimension3) is a 3D action "game without content." This engine is aimed directly at mod makers and anybody interesting in creating their own 3D game. These people have done wonderful things with other engines, but they are extending an engine that was basically designed for a single game. Dim3 is the opposite ... an engine designed for all games!
You may want to check out more Mac applications, such as World of Warcraft Interface AddOn Kit or Endarchy, which might be similar to dim3.