Microsoft OneNote

I use it nearly on a daily basis but I implemented it for work. I use it to set up my construction jobs so I can put dailies in it and they are immediately synced with my office to grab time and job codes from. I used it to coordinate with the engineering firm I worked with on my last job to help them keep track of my quantities easier.

If you are in school, I would think if you had a group of friends all using it in class using different notes, everyone would grab different information you could sort through.

Best of all, it is a very solid free program.