Lingvosoft provides Estonian translation software for PalmOS. You can download trial versions, to see what works best for you. The software packages fall into these basic categories:

• Estonian Talking Dictionary (just under $50). This is what most people are looking for. Load this on your machine, and you have a virtual translation device. It delivers instant bi-directional translation of all the words and phrases in its massive database.
   

• Estonian Flashcards (just under $40). These make studying and foreign language as easy and enjoyable as it should be. Featuring 5 enjoyable games that make learning fun, they are the most effective way to memorize thousands of new words. Just install this program on your computer, and you can begin  developing your command of a second language in record time. The  customizable interface allows you to choose from numerous options to make the experience the most comfortable possible.
   

• Estonian Software Bundles (prices vary, depending on the bundle). A software bundle can provide significant cost-savings, if you need multiple languages or you want to combine the features of other offerings into a single economical package.