Universal Credit: Other financial support?

What are passported benefits?

Passported benefits are benefits or schemes which some groups of people are entitled to because of their entitlement to certain other benefits or tax credits.

https://www.gov.uk/universal-credit/other-financial-support

Just trying to research what other financial support or schemes that are available for those in receipt of UC? There is a list of them on the link above, but is that everything? Are there things that they don't advertise? Could be anything at all, if you know of anything then please share it

PS - do the jobcentre still do the "jobcentre plus flexible support" scheme? tried to search but found nothing useful