1)   ChemDBsoft Academic Lite
Chemical database software for management of databases of any size, structure drawing, SDF import/export, duplicate removal, diversity analysis, chemical web server, combinatorial chemistry, prediction of LogP/LogC, and MASS/NMR/IR spectra management

 2)   BATE pH calculator 1.0.0.30
BATE calculates pH of solutions containing mixtures of acid and base with up to 4 dissociation steps and titration curves for these acids and bases. Ionic strentgh calculations included. Built-in database of common weak acids and bases.

 3)   Doctor Aquarium 2008
Doctor Aquarium, an innovative aquarium automation assistant that monitors the health of your aquarium and takes actions so it will not get sick. It works with standard X10 home automation modules, and can measue pH, Temperature, Light Levels, Sound

 4)   Water Test (Langelier) 1.1.8
This program uses the Langelier saturation index to balance the water. This is a very accurate and effective way of balancing water. Now with built-in Access database for recording and reporting test results.