WELP.
SkyUI is now offering paid support.
What's more, the next update - which will require payment - is going to tackle crafting menus. The one thing that everybody wanted it to do but that it didn't interact with.
EDIT2: I know a lot of people are going to think this is a fear-mongering post, but just to clarify:
this is not about the fact that SkyUI is going away, or that it will no longer be able to be used for a free user. The free version will still be available for download, and in theory, the MCM will still be updated. This is to highlight that a very prominent mod in the community is being updated with further paid support. It is a powerful message to Valve and to Bethesda, in my opinion, and sets a precedent for the discussion going forward.
EDIT: For those who are just perusing this thread and need some more context:
SkyUI is one of the fundamental mods that most builds, regardless of how crazy or how vanilla you like your experience to be, require in order to get their game running. It also comes built-in with what is known as the MCM, or Mod Configuration Menu, which permits other mods to basically permit users to alter settings in-game.
While this isn't the end of the world - any changes to the MCM that get made in 5.0 are going to get shifted into the 'free' version of SkyUI that is still up in the Nexus - this potentially sends a big message to mod authors and Bethesda.
SkyUI is consistently among the top 10 mods of all time, and is one of the most, if not THE most, downloaded and endorsed mods for Skyrim. It is considered a crowning achievement of the modding community in that it was free, and heavily overhauled the interface to make it useful.
And it is now going to require payment in order for you to receive any further benefits. Drop the mic.