My idea of the perfect 3rd party Steam calculator. (x-post from /r/pcmasterrace) : r/Steam
Godspark Gaming - Used this Steam calculator to find the total playtime spent on all Steam games, as well as some other interesting statistics. How much time have you spent on playing
Steam Level Calculator
Steam Leveling Guide | CSGORoll
Steam Profile Calculator | RaceDepartment
Level 5000: The most expensive Steam account is said to be worth roughly $ 280K
All Steam Level Badges : r/Steam
How to Level Up on Steam Fast
Steam Calculator | Steam Account Value | How much is my steam account worth?
How to level up on Steam > Best Guide | CSGOHowl
SteamLevelU | Fast and Сheap way to level up! With us you can level up your Steam profile
We Are A Comprehensive Guide To Increasing The Steam Account Level