AvantGo is a pretty cool site if you have a PDA (a Palm Pilot or a Handspring Visor). It’s been around for a long time and I’ve used it before to get updates on the Gators and Red Sox and such. They have a new page that allows you to connect your mobile phone to your PDA. There’s a wizard that makes it very easy to buy the right cable and / or tell you how to get wireless web service in your area. Cool.
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Core Data Mastery
If you're an iOS developer, you absolutely need to get a copy of Core Data Mastery from Big Mountain Studio. It is hands-down the best resource for learning how to use Core Data with SwiftUI.