This alphabetically organized webpage gives an “overview of the wide variety of information and documentation resources made available by various entities across the United Nations System“.

http://research.un.org/en/un-resources

Be aware that some resources need an official log-in, but many are open access.

I noted just a few among the abundance of useful resources:

• Databases giving access to the case law of several International Criminal Tribunals
• Database of of all International Law Commission documents, including reports, texts and commentaries, summary records, etc.
• Terminology on disaster risk, tourism, world trade…

You might also be interested in this compilation of UN resources by GlobaLex at NYU law that I posted about a few months ago.

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Credit: Many thanks to Library Boy.