I wrote tlbx.io as a side-project, mostly for the fun or developing something on App Engine again. But it has slowly grown into something quite useful that may help you manage your Dropbox more efficiently.
My favourite feature is the Camera Uploads “automation” that will listen for changes in your Camera Uploads Dropbox folder and move new photos and videos to sub folders named after the year and month (like “Camera Uploads/2015/03/”). That’s a web service, so once you enable it, everything happens “automagically” as new photos/videos are uploaded.
Yeah, I’d like something like that, but for normal files on a system.
For space analysis, baobab is great.
I’ve been using jdiskreport for the last 10 years or so, it works a treat and it supports all main operating systems where the sun JVM runs