Consider going straight to Google itself and see what technology tools appear in their list of apps. Much easier than searching for your own. Since many businesses and organizations also use Google Mail as their internal communication platform, the now mainstream acceptance means the apps are likely fairly robust and worth a try.

The statistical software language R is open-source with free download for Windows PCs. It's a bit cumbersome to learn with the help manuals running to 4,000 pages of "stream of consciousness" thinking. However, it's very powerful, and will readily do things that (say) Excel cannot do. Scripts can be saved to Word documents for later re-use.

The Matlab tools are extremely helpful in mathematical modeling and run very well on a home computer. My application was in software engineering at the Master's level. Student license costs are about $200 - $300 or so, depending how many tools are downloaded.