A native mac client to connect to vSphere is available at hxxp://vclient.top , it provides functionality to connect to both esx and vcenter, having the ability to go through inventories, favorite vms, open VM screen, start/suspend VMs, etc.
The whole operations is quiet simple
1. Open vClient.app
2. Click plus button on the left-top corner, connect to a server, e.g. your-vcenter.com (without http/https) with credential
3. Your will have three tabs: Host inventory/Data center inventory/Favorite VMs
4. Right click a VM, you can favorite a VM, which means it's not needed to open the big vCenter/Esx next time if you just want to access this VM
Moderator edit by wila: Link is broken, changed http to hxxp to no longer make it clickable.