This is Kali Linux's main package repository:
https://http.kali.org/

Your nearest mirror:
http://http.kali.org/README?mirrorlist

More information about Kali Linux's mirrors:
https://www.kali.org/docs/community/kali-linux-mirrors/

Kali Linux, The Most Advanced Penetration Testing Distribution. Ever.
https://www.kali.org/