- Fretuoso is an educational game for learning the fretboard of the guitar, bass and other stringed instruments.
- Text With is a series of educational AI chatbot apps, allowing the user to have deep conversations with historical figures (in Text With History) and Biblical characters (in Text With Jesus). The apps are powered by the ChatGPT AI engine, and are available for free on the App Store.
- Texts From, a series of simple apps used to get daily quotes from Jesus, Oscar Wilde, Donald Trump, Bernie Sanders, or the Founding Fathers of the United States.
- Play Him Off, Keyboard Cat!, my first iOS app, is essentially a convenient archive of Keyboard Cat mashup videos, a YouTube meme that became very popular around 2009.
Java Mobile Applications (J2ME)
- Guitar Trainer was originally written for older mobile phones (including Blackberry), as a J2ME app that could be purchased directly from my MobileTutor.org website. The last version is now free to download.
- Before the advent of online marketplaces such as the App Store and Google Play, the MobileTutor.org store backend was entirely designed from scratch, with payment processing through PayPal, Amazon, Google Checkout and a number of other mobile payment processors.