Our website provides a free download of ACT-1 2.7. ACT-1 is included in System Utilities. Our antivirus scan shows that this download is safe. The most popular version of the tool is 2.7. The actual developer of the free program is NIKON CORPORATION. The common filename for the program's installer is act1.exe.
From the developer:
An application program designed to allow operation of the Nikon Digital Sight DS-L1 camera control unit from a networked high-performance PC. The ACT-1 program allows basic digital imaging operations such as image capture, saving, printing, and deleting to be performed, and in addition provides access to more advanced image processing, display manipulation, and image analysis functions.
You may want to check out more software, such as Dialshark or iPF500 Media Configuration Tool, which might be similar to ACT-1.