An overview of these options can be found on the University of Birmingham's iCite Guide:
EndNote Online (or EndNote Web) is available to University users through Web of Science: set up an account within Web of Science, and look for the Endnote tab at the top of the WoS screen. The following guide has more details:
Examples of other referencing software programmes are:
NB: these programmes are not officially supported at the University of Birmingham, and you will need to use the online forums and supplier support channels for any queries.