Skyscraper Alpha 1
The unknown version of Skyscraper Alpha 1 is available as a free download on our website. The most popular version among Skyscraper Alpha 1 users is 2.0. The program lies within Home & Hobby Tools, more precisely General. This free program is a product of Ryan Thoryk.
From the developer:
Welcome to the Skyscraper Project website, home to the Skyscraper open-source 3D building simulator. If you're interested in highrise architecture and elevators, then you've come to the right place. Skyscraper allows you to create your own buildings and experience them in full first-person 3D
You may want to check out more software, such as Alpha Project - Close Combat Mappack, Alpha Key Saver or Alpha Five, which might be related to Skyscraper Alpha 1.