Netfilter
Self-management program that can block access to the desired site
Introduction Page: https://www.bfy.kr/netfilter-2/
Netfilter currently supports 2 languages: ko-KR, en-US
You can use this code and program as you want by keeping the license. You can also create an issue if you have any bugs or features you would like to suggest.
Currently, the program is developed and managed by BFY PDCT.