Options Lt - option calculator

Hyperfocal - depth of field calculator with blur simulation and circle of confusion estimation

Photo & Video

Word Match - learn Mandarin

Chinese words for HSK1,2,3

GetRate Currency Exchange Rate

Finance

True Horizon - camera level with artistic angle modes

Photo & Video

Photo Copy Level - digitizer with image stabilization and a magnifying glass

Productivity

Pinyin - learn how to pronounce Mandarin Chinese characters

Education

KangXi learn Chinese radicals

learn HSK1 - HSK6 characters

iOptioneer Lt - option risk

interactive strategy simulator

Cubic Solver - graph and roots

interactive graphing math tool

Bell Curves - graphing calculator for the normal distribution function

Education

Twinkle - Mandarin Chinese

learn 1500 phrases HSK1 - HSK4

Mag Hanzi learn Mandarin

Chinese language phrases

Money Meter - time and rate your income! Motivation, analysis and time management tool, including a rate timer and converter.

Productivity

Bopomofo - pinyin to zhuyin

learn Chinese alphabet

Measure - learn Mandarin Chinese measure words in this simple game

Education