WorkshopMonitor is a custom Cities: Skylines mod displaying statistics about the usage of workshop items while in-game. It gathers information about installed workshop items and information about all placed buildings. This includes 'zoned' buildings like residential and commercial buildings, parks, unique buildings and service buildings.

I'm a big fan of using custom workshop items in my cities. I roam the workshop on a regular basis and keep on subscribing to mods of which I think they might look cool in my current/next city. This has lead to a situation where I've subscribed to hundreds of workshop items without actually using them all. In fact, I think I use maybe half of the workshop items I subscribed to. This has a serious impact on the performance of the game, so recently I wanted to do some cleanup of my workshop items. However, I didn't want to unsubscribe mods that I already used as that might leave gaping holes in my cities, so I needed a way to find out which workshop items I was actually using in my cities and which I wasn't. Hence, the WorkshopMonitor mod. It displays a list of all subscribed workshop items and the number of instances of that workshop item in the current city.

While in-game, hit ctrl+shift+A to open the WorkshopMonitor main dialog. Hit escape or click the close button to hide it again. That's it.

• v0.1: First version

The following mods/modbuilders deserve quite some credit as they made building the WorkshopMonitor mod possible:

• Skylines Overwatch created by Soda (SteamCommunity/GitHub). This mod is a framework for realtime monitoring of buildings, vehicles, animals and humans. The mod is made to be reused by other mods but I chose to only use parts of the mod in WorkshopMonitor, as I needed some specific tweaks to the building monitoring logic. Still, all the credits for this awesome piece of code goes to Soda.
• Extended Public Transport UI created by AcidF!re (SteamCommunity/GitHub). The WorkshopMonitor mod needed some specific UI components to display a large list of items in a grid-like view. The EPTUI mod had these components built-in so these are incorporated as well. The original code has been modified significantly but again, all credits go to AcidF!re, as he showed how to build a nice UI for WorkshopMonitor.
• ModTools created by nlight/BloodyPenguin (SteamCommunity/GitHub). This is a great mod for modbuilders, giving insight into the inner workings of Cities: Skylines.