What iPhone developer 3rd party products and services do you use?

HockeyApp http://hockeyapp.net/
Reliable crash reporting for beta and live apps, including server side symbolication and crash grouping. Beta distribution and management.

Localytics http://localytics.com/
Live analytics for usage reporting.

QuincyKit http://quincykit.net/
Open Source crash reporting framework for Mac and iOS. Manages sending crash reports to a server. Client can be used with HockeyApp or its own open source server. (Available since 2009)

HockeyKit http://hockeykit.net/
Open source beta distribution framework for iOS and Android. Manages distribution beta versions easily, including in app updates. Client can be used with HockeyApp or its own open source server. (Available since August 2010)

PLCrashReporter http://code.google.com/p/plcrashreporter/
Collect crash reports reliably on iOS and Mac (not all CPU architectures on Mac yet fully supported). Is being used by QuincyKit and HockeyApp. (Available since 2009)

KIF https://github.com/square/KIF
Test framework for automated UI testing. Also helps testing regressions, memory issues, non reproducible crashes.

AFNetworking https://github.com/AFNetworking/AFNetworking
Efficient networking framework

JSONKit https://github.com/johnezang/JSONKit
Very fast JSON framework, as of now the fastest out there.

AppSales-Mobile https://github.com/omz/AppSales-Mobile
Download and analyze iTunes Connect sales data for your apps.

Three20 http://three20.info/
Mostly for ui things like the pull-down-to-refresh-tableview.

iCarousel https://github.com/nicklockwood/iCarousel
Open Coverflow clone.

ASIHttp http://allseeing-i.com/ASIHTTPRequest/
If NSURLConnection is not enough.

OpenClusterMapView https://github.com/yinkou/OCMapView
To also mention my own little project here: a quick, very simple and free clustering framework for the MKMapView

In fact, there is a great website called http://cocoacontrols.com/ where you can look for great controls for either OS X or iOS.

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