The CIM cmdlets are found in the CIMcmdlets module.
Get-Command -Module CimCmdlets produces this list of names. I’ve added some information on the tasks they perform
Get-CimAssociatedInstance is for working with WMI associated classes
Get-CimClass is for discovering the properties and methods of a WMI class
Get-CimInstance is analogous to Get-WmiObject
Get-CimSession
Invoke-CimMethod is analogous to Invoke-WMIMethod
New-CimInstance can be used for creating a new WMI instance in certain circumstances
New-CimSession
New-CimSessionOption
Register-CimIndicationEvent is analogous to Register-WMIEvent
Remove-CimInstance is analogous to Remove-WMIObject
Remove-CimSession
Set-CimInstance is analogous to Set-WMIInstance
The CIM session cmdlets are for working with the CIm sessions which are analogous to PowerShell remoting sessions but are used by the CIM cmdlets AND the new WMI based cmdlets in Windows 8/2012 such as the networking cmdlets