Apps
Some of the apps I have made. See complete list of apps in iOS AppStore and Google Play.
iDOS, also known as DOSPad.
A DOS Emulator based on dosbox.
TeX Writer.
TeX/LaTeX Editor and Compiler for iOS and Android.

Golden Ear. A Lossless Music Player for iOS.
Write Only.
A minimalistic typewriter app for iOS.
LotsDots.
Thinking by connecting dots.
HiveMemo.
Spaced repetition flash card app for learning.
Twinkle Notes.
Build your private knowledge base with end-to-end encrypted notes.
AEMULA,
80486 PC Emulator for ARM. Written from sratch.
TeX Equation.
Typeset equation on iPad and paste into Pages/Keynote. For people working with formulas.