Good Free Games on Steam?

What are some good free to play games on Steam? I want to play something good but also playable on my Laptop.

Specs: Lenovo Flex 3 11 inch
Intel Celeron N3050 1.6 Ghz (2.16 Ghz Turbo Boost)
Intel HD Graphics Mobile (Braswell)
4 GB RAM
Windows 10 Home

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