A simple but free learn Spanish software is available at Linguasaver. The software is in fact a simple screen saver that presents a variety of Spanish or English words and phrases and then after some time, presents the equivalent phrase.

The tool is a simple way of increasing basic vocabulary and phrases, and while it may not have all the bells and whistles of other free programs, it does provide some useful vocabulary building help.

On the paid but inexpensive side, consider Talk Now Spanish Beginner Software or the Talk Now Mexican Spanish Software.

Also,  consider viewing our post on Pimsleur Spanish Alternatives.