I just finished up my masters in CS from OMSCS at GT and some of the classes allow a sheet of notes. It's still a thing, even in the days of online education and proctor software.
I graduated that program a few years ago. The best final I had was Intro to HPC, you were allowed to use book, notes, internet, etc. The questions were open-ended and in-depth enough that the average on the test was still around 60-70 IIRC. You need a very deep understanding of the material to answer the questions sufficiently.