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A small tool helps you to balance the chemical formulas.
GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching geometry, algebra, statistics, and calculus. Download the free software at http://www.geogebra.org. Find the source code at http://www.geogebra.org/trac
A foreign language learning software provided by a Chinese high school student. Its name "Lamplicit" is a combination of "language" and "implicit".