For ESXi 6.0 Update 2 or later, VMware provided an alternative modern management interface:
Before downloading and installing vSphere Client 6.0, ensure that your system meets the following requirements: vsphere client 6.0 download link
To understand the download process for version 6.0, it is essential to remember the architectural shift that occurred during its lifecycle. vSphere 6.0 marked the transition away from the legacy C# thick client (the executable installed directly on Windows) toward the web-based (Flex-based) and eventually the HTML5-based vSphere Client. For ESXi 6
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The client typically requires a Windows environment (Windows 7 or later) to run.