Default Free up ram on Nook HD+ running CM 10.1.3

I'd like to know if there are existing lists or if anyone knows what apps/services can be safely frozen/uninstalled to free up ram. I find that useless services like Google contact sync or Google calender sync are constantly opening themselves and taking up ram. I have backed up and frozen the two mentioned but im curious if these can be uninstalled and what other apps/services can be frozen or uninstalled safely.