ChemSketch is a free software, similar to ChemDraw, containing functions such as making chemical movies (above).
Other free drawing software includes:
Free molecular graphics and visualization programs:
Material Safety Data Sheets (MSDS Online)
Over one million Materials Safety Data Sheets. A Material Safety Data Sheet (MSDS) is a summary of information on a given chemical identifying material, health, and physical hazards, exposure limits, and precautions.