Great for automatic/instant/mindless backups and great for sharing folders, files, and specifically screenshots and screen-casts.
This is our 7th year of using Dropbox Premium. It is a must have!
If you take notes on paper, white board, or keyboard this tool can make it all searchable. I have used this tool for 4 years now and this is my first year getting Evernote Premium.
My text editor of choice is ST3. I have a registered version and use it daily. This site was bit with ST3. :)
Plugins used with ST3: Package Control, SFTP(paid), Emmet, LESS, Hayaku.