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](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) and per-site metas
- Stack Apps
- Area 51 Discussion
- [Interpersonal Skills](https://twitter.com/aalear/status/1052322898252304384)