Here in Phabricator/Phorge we have the [[ https://phabricator.wikimedia.org/legalpad/ | legalpad ]] application which doesn't come from upstream but has once been developed for specific needs of WMF Legal.
Since then many years have passed and Legal nowadays uses a different process to handle NDA requests.
In T349595 it has recently been decided by Legal that one of the pads inside it, L2 is now retired.
This leaves us with L3 which is used to sign the "server access responsibilities" which is a formality by SRE as part of handing out shell access to production systems.
Plus we have these remaining use cases as pointed out by @RhinosF1
L45 - VRTS users "NDA" (question is, if Legal says they don't use L2 - that probably also means L45 should be replaced the same way)
This document is also translated into many languages and the full list of documents is shown here:
https://phabricator.wikimedia.org/legalpad/query/all/
Other than that:
L36 Wiki Loves Monuments − Photo Sharing Permission (users give permission to their photos being used on social media)
L35 Commitment to the Code of Conduct for Wikimedia Technical Spaces (not used per @Urbanecm ?)
Since none of these are used by the actual legal team anymore it begs the question why we can't do the same signatures on a wiki somewhere.
If that was the cause we could get rid of this custom app that doesn't really have a maintainer and we could simplify our setup and get closer to standard upstream Phorge.
So this task would be mostly going through the list of pads and talk to people to find out.