F-Stop Media Gallery - Image and video organizer.

WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.

A Photo Manager - Manage local photos on Android: gallery, geotag with photomap, tags, find, sort, view, copy...

WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.

LeafPic - LeafPic is a fluid, material-designed alternative gallery.

SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.