Here’s some useful sites and tools for Steam users.
https://steamdb.info/ – Database of steam games, you can calculate your account value, look for details about games, check for sales, see statistics about how many players are in game, what games are trending and much more.
https://steamhunters.com/profiles – A very useful site if you enjoy unlocking achievements. the site tracks your achievement and game progress. there’s user guides for specific achievements, you can see how long it takes on average to complete a game, and more.
https://steam.tools/ – a very cool websites that have many useful tools. you can see all the trading cards, emoticons, backgrounds, that are currently on steam and sort them by value.
You can create cool mosaic using emoticons, and see the value of your inventory items.