I have 2 Mac OS X Apps on the AppStore so far and there are more to be expected.
I also love making GUI software that runs and compiles from the terminal.
Projects
I'd say that coding apps that run natively on the desktop has peaked my curiosity the most. I've always enjoyed creating them from scratch and learning how they work because of the complexity and flexibility involved.

Quick Weather
Ranked among the top in the Weather section for Mac, this application on the AppStore has cool CSS animations with a menubar extension that can display the current weather for any city.

Amazing Tic Tac Toe
Ranked in the top 150 in the Games section for Mac, this Tic Tac Toe app is modern and sleek and easy to use with different intensity levels. There is also a multiplayer option, one for sharing a computer and another for using websockets to play online globally.

Stock Predictor
This is a GUI tool built with Swift, Python, and R that lets the users look up any stock or index symbol. The app will automatically pull the real-time market data to generate a graph of how the stock may do for the rest of the year. Swift is used for the UI and compiling, and Python is used for the data scraping, server side requests, and organizing the JSON data. The predicted time-series is output of an R algorithm.

Image Uploader
This will be the cheapest Mac App to obtain direct online links to your local images. The app will provide a choice of several services, to get an online link for any image and this link can be shared with your friends. Also, the app saves all your history of the images and links which you can choose to delete anytime.

To Do App
This is a todo list application for Mac OSX, Windows, and Linux. It was written, compiled, and exported in Processing.

Dr. Henry's Chess Game
This is a cross-platform desktop app built with Electron and Java for the Mac, Windows, and Linux OSs. It is a 6-leveled chess game app where the user plays against an AI. The game is developed by Dr. Henry and coded in Java and the homepage is built with Node JS (Electron). https://ozanmirza1.github.io/AI-Chess-Game/