HELYX-OS was an open-source GUI for OpenFOAM® v4.1 and v1606+, developed by ENGYS, but has been deprecated. While HELYX-OS is no longer actively developed, ENGYS continues to offer advanced CFD solutions with HELYX.
HELYX-OS is no longer maintained, but you can still install the last available version. Follow the instructions to set up HELYX-OS on your system and continue using its features.