CocoaPods
I'm really glad I took the time to learn and use CocoaPods on this latest project. Such a massive time saver for iOS devs. No more adding linker flags, copying bundles and keeping external frameworks up-to-date manually.
I simply write a Podfile (similar to a Gemfile if you come from the Ruby world), and run "pod install." If a library I'm using has been updated I run "pod update". If a library I want to use isn't available, you can easily submit it to their list of specs on Github.
Great stuff.
Spark Inspector
Its like a Web Inspector for iOS apps. Modify your UI's properties and see the changes live in the Simulator or on your iOS device. you can also see your views in a 3D extruded mode to get a better grasp over how your UI is being laid out.
There's also a notification monitor to see notifications and their payloads as they are fired with the added ability to go back and resend them. Not used this much yet but it looks snazzy.
Crashlytics
I like TestFlight for distributing builds though I will be using Hockey on our next internal app because I've heard great things.
However I no longer ship the TestFlight SDK in our apps because I find the crash monitoring in Crashlytics to be far superior. You can group similar crashes and mark them closed once you've fixed the issue. You also get so many more useful details like available disk space, how many users are affected, etc so I would recommend you give it a shot. I'm a fan.
We're in the business of building things that makes our lives easier and these tools make the development easier.