This one's related to my day job rather than game development.  I'm working on a Shibboleth to OAuth2 Proxy.  The reason for this is to make it easy for mobile developers to create apps for higher education that login to the UK's Access Federation.

I'm basing it on work done here:

https://www.switch.ch/aai/support/tools/aai-for-apps.html

So far, I've got their proof of concept up and running against TestShib, and I've just started work on the iOS client.

One aspect is that I need to be able to communicate between my app and the browser.  Here's a useful guide on setting up custom URL schemas to do that:

http://iosdevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html