Drobo Apps gives you cool add-ons for Drobo
Because Drobo is built on a small version of the Linux open source OS, you are able to run these lightweight applications that can do some awesome things. There are currently around 20 applications that can create an iTunes media server (Firefly), or limit the total size of a Time Machine backup (Time Tamer), among other functions.
If you're a Drobo owner, you might want to check out these cool new applications. And if you're a developer, why not take a look at the Drobo development SDK?