Chemix Ver3.50 (click to view details)
Description: Another software which is a little inferior to chemsketch and does not come free. It is an evaluation version (works for some time and allows you to check the features), however, if you are satisfied with the quality you can buy the full version from their website. The software boasts features such as a periodic table, molecular calculator, thermochemistry, electrochemistry, solubility product, acid/base calculator, molecular 3D viewer and NMR, IR, and MS spectroscopy. However it is comparitively more difficult to use and is not free, but worth a try.
Instructions: Download the setup file by clicking on the the "Download Now" link. Run the setup file and follow the instructions to setup the software.
Price: Evaluation version (limited number of runs), however you can buy a full version of the software from the website.
Developer's Website: http://home.c2i.net/astandne/