Based on memory and observation:

- [Non-English SE sites](https://meta.stackexchange.com/questions/271193/shouldnt-non-english-se-sites-be-excluded-from-hot-network-questions) ([localized Stack Overflow sites](https://meta.stackexchange.com/questions/252518/questions-from-ru-so-shouldnt-become-hot) and [Russian language in Russian](https://meta.stackexchange.com/questions/257066/questions-from-rus-se-shouldnt-become-hot?noredirect=1&lq=1))
- [Meta Stack Exchange](https://meta.stackexchange.com/questions/280505/include-questions-from-meta-se-in-the-hot-network-questions-or-in-the-commun)
- Per-site metas, including Area 51 Discussions
- Stack Apps
- [Interpersonal Skills](https://interpersonal.meta.stackexchange.com/q/3330)