ManageEngine ADManager Plus's 'Active Directory Replication Manager' is a free tool that enables an administrator (or an equivalent domain user) to force the 'Replication' of data in a Domain or the Entire Forest. The 'AD Replication Manager' also allows replication of data between two Domain Controllers. This powershell cmdlet tool also lists comprehensive reports on the last replication of Active Directory data.
'add-PSSnapin ReplicationManager' followed by 'Get-ReplicationManager'.