Steam DLC Discovery Hub

Valve announces the launch of Steam Labs Experiment 15, a new Discovery Hub for DLC For Your Games. This will help you find DLC for games you already own. This may seem a simple operation but it can take some horsepower to sort through the 690 DLC for Train Simulator Classic. Here's more on this solution to this... problem(?):
Today's new Steam Labs experiment is a store hub designed to help you find new content to enjoy in the games you already play.

You may have missed or forgotten about exciting add-on content for your favorite games, and this hub is designed to help you explore what is available and find ways of getting more of those great games. Whether it is individual character skins, content packs, new game modes, or huge expansion packs, there is probably something of interest to you.