If your computers are on for much of the day, you might want to consider downloading the BOINC software and choosing one or more projects. There are many projects out there, so look through them and add the ones that fit your view of helping out.
Here’s a video of just one of the projects out there (and it has 5 different applications)!:
You can run multiple projects and set the percentage of time for each.
Tags: charity, climate, computer, Food, Health, open source, Research, software, space