These apps are available for sale in the iOS or Mac App Store.
SwiftoDo is my todo.txt app for iOS. It is written in Swift and is based on UIKit.
SwiftoDo Desktop is my todo.txt app for macOS. It is written in Swift and is based on AppKit.
Simple Call Blocker is my call blocking app for iOS. It is written in Swift and is based on UIKit.
This project is something I did recently, but is expected to be static.
These projects are, essentially, abandoned at this point.
TodoTxtMac was my first Mac app. It is a todo.txt app, written in Objective C and based on AppKit. It was featured on LifeHacker and linked to from the todo.txt homepage.
I contributed a lot of updates to todotxt.net, a .NET todo.txt client for Windows that was created and coded by Ben R. Hughes. Working on this app got me back into programming outside of work.