Unnecessary files and directories take up valuable space on hard disks or SSDs. Baobab lets you locate and remove data garbage at the push of a button.
When it comes to cheap flash memory, buyers should beware. Fake flash memory often offers only a fraction of the advertised storage capacity. With no visible calibration mark, it isn't easy to discover a counterfeit. Here's a test to weed out fake disks.
Storing log files in RAM reduces the number of read and write operations, which can extend the life span of an SD card (or any solid state storage device, for that matter). While you can enable and configure logging to RAM manually, LogRunner provides a more elegant solution.
Git-annex is storage software that distributes files across devices, servers, and cloud services. It can encrypt files and keep everything in sync, and it always knows where to find your data.
openATTIC promises open source, unified storage management for heterogeneous media. The easy web interface even supports network drives accessed through SMB and NFS.