Thoughtfarmer - Not a UI project but a pretty good visual identity for an intranet platform.

I've heard good things about Igloo, which is a plug-and-play enterprise solution for creating beautiful intranets:

Link: https://www.igloosoftware.com/

If you have the moolah, NNGroup did an exhaustive study on it here:

http://www.nngroup.com/reports/intranet-portals-experiences-real-life-projects/

Thank you everyone! Every bit helps!

One we did for BAE Systems: https://www.dropbox.com/s/cdvtvk37957s8ur/s0X6t8k99ltZEO_5FJ_Owl9KdnwDxcM2H09xWDKwfbc.png?dl=0

Not the final version for obvious reasons, but closer.

http://honey.is seems to be doing a pretty great job.

I don't know much about the project personally, but you might want to check out Big Spaceship's work on Chobani Home.

I designed one that was never used. Might have to dig it up.

Update:

Here's one screen: http://cl.ly/c6aq