[Original] Evernote [The Safer Alternative:] 
SpiderNote. It may be a bit cobbled together, but as an old Evernote fan I needed a good alternative and it should be able to sync between all my Macs. So I save my notes in a SpiderOak folder and search them with Spotlight. Not as fancy as Evernote, but the price (risk) of storing my data unencrypted on an American server became too high.