I've released a couple of apps for iOS and OS X. I also sometimes release open source code on Github.
ID-Photo (iOS): ID-Photo is an all-in-one solution for taking biometric passport and ID photos, right on your iOS device. You can take photos via the device's camera or pick existing ones. In any case, ID-Photo helps you hitting the right alignment using an overlay grid. Afterwards, you can edit the photo or save, print or export it as passport prints. Available on the App Store.
MultiSound (iOS): MultiSound simulates the sound of five typical household appliances (hair dryer, washing machine, microwave oven and dishwasher), some with multiple sounds and models. Available on the App Store.
Cryptical (iOS): Cryptical is a full featured password generator designed to help system administrators and everyone else who needs strong, random passwords. Available on the App Store.
MonthlySales (iOS): An App Store revenue overview, adjusted by Apple's Fiscal Calendar. Get the source on GitHub.
IconWiz (OS X): IconWiz is a small OS X utility helping you to create icons for all Apple platforms (iOS, watchOS, OS X and CarPlay). It matches all the current icon sizes. Available on the Mac App Store.
SimArchive (OS X): SimArchive lets you import and export iOS Simulator builds with ease. Use it to quickly send someone else a build, keep a snapshot of your current app (including Documents directory) or deploy a build to other iOS Simulator devices. Free download.
DictationSwitcher (OS X): DictationSwitcher is a little utility that sits in your Mac’s menu bar and makes using dictation on OS X a lot easier. It lets you quickly switch between dictation languages, even with a keystroke, access the dictation system preferences pane directly and turn on/off dictation. Free download.
RFAboutView (iOS; Objective-C): RFAboutView is an easy, drop-in solution to display copyright, support, privacy and other information while also automatically crediting the developers of third-party Cocoapods. Objective-C version. Available on Github.
RFAboutView (iOS; Swift): RFAboutView is an easy, drop-in solution to display copyright, support, privacy and other information while also automatically crediting the developers of third-party Cocoapods. Swift version. Available on Github.