I have written in the past about HPE software and driver repositories – Automatically download HP drivers to VMware Update Manager and New URLs for HP(E) Online Depot for VMWare
There is also similar repository for Dell – https://vmwaredepot.dell.com/index.xml. By adding this to Update Manager it will download additional Dell software – Dell EMC OpenManage Server Administrator and Dell EMC iDRAC Service Module.
We have found the Dell EMC iDRAC Service Module very useful. It provides OS information to iDRAC and also installs binaries which you can use to reset iDRAC from ESXi if it becomes unresponsive (command: /opt/dell/srvadmin/iSM/bin/Invoke-iDRACHardReset -f )