I was looking over the Discourse forum to see if they did an IOS App to allow users to get Notifications, and interaction with a given forum site. Similar to the wordpress and Stackoverflow apps.
This does not look like it would do push Notifications?
Personally I try to only use apps by the same company rather than give out login details to third party apps.
Discourse has a nice API, so my understanding is that you could create an app that creates a wrapper around the website, with some bonus native features like push notifications. So the login / password info would only be sent to our servers.