Find a bug?  The first reporter of a bug will be rewarded a promo code of any app in below.

Golden Ear. A Lossless Music Player for iOS.

TeX Writer. TeX/LaTeX Editor and Compiler for iOS and Android.

iDOS. Released on A DOS Emulator based on dosbox. An elder brother of iDOS, known as DOSPad, is living inside Cydia space.

Write Only. A minimalistic typewriter app for iOS.

BtStamp. Timestamping documents in the bitcoin blockchain.

TeX Equation. Typeset equation on iPad and paste into Pages/Keynote. For people working with formulas.

VI Touch. VI Editor for iPhone/iPad.

Page Scanner. Powerful document scanner for iPhone. With continuous scan for book scanners.