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SGDBoop
A program used for applying custom artwork to Steam, using SteamGridDB. Supports both Windows and Linux, written completely in C.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Second, you need to download the tool, to do that just go to this page and in the download section of the page click on the Linux version if you want this for the steam deck or the windows version if you want it for your Windows PC. Then go where you downloaded the zip, unzip it and enter inside the folder. On Linux (Steam Deck) you will have to do an additional step: right click on the executable called "steamgrid" click on properties and then move to the tab called "Permissions" in this tab you will have to enable the check box that says "Is Executable".
You can find practically all the images of each type for every existing game in www.steamgriddb.com, just enter the page, type the game that you want to find images, select it, and you will have a lot of images classified by types, grids (for covers and Banners), Heroes, Logos, and Icons. This page have practically all the official images and a lot of fan ones. It also have a tool called SGDBoop which is a tool to individually change the art of each Steam game with a single click from within the page.