A place to list software that integrates Yggdrasil

So far, I am aware of:

- yggmail https://github.com/neilalexander/yggmail
- NNCP just added Yggdrasil support - http://www.nncpgo.org/Yggdrasil.html

Are there others?

I would be happy to PR this if someone would tell me where they'd like to see it live.