Computer monitoring and time tracking app for windows desktop.
Features Metro style UI, automatic activity tracking, screenshots.

Built with C# and WPF.

Source code is here
Download link

Python Mobile IDE
3M+ Downloads

App Store
Google Play

Android and iOS dictionary app for searching over 170.000 words and phrases.
200.000+ downloads.
Built with Java on Android and Swift on iOS. Uses Full Text Search for blazing fast lookup of translations.

Website
Google Play
App Store

Android Library for asynchronous requesting of Runtime Permissons with Kotlin Coroutines.

Android Arsenal
Source Code

Social network for cats.
Made with Flutter and Dart.

App Store
Google Play

Nutrition diary and Calorie counter app for Android and iOS.
Built with Flutter and Dart.

App Store
Google Play

MacOS time tracking app.
Built with Flutter and Dart, native plugins written in Swift

App Store

Android App that simulates programming.
+100.000 downloads.
Built with Kotlin.

Google Play

Android News reader app.
Shows how to use MVP architecture with Kotlin Coroutines, Realm as Database and Retrofit for HTTP calls.

Source Code

Validation library for JVM languages, written in Kotlin.

Android Arsenal
Source Code

Word puzzle game, built with Flutter and Dart.

Source Code
Play Store
App Store

.NET generic IList implementations that avoids Large Object Heap allocations

Source Code