Sociall (Beta) - A secure and private decentralised social network for all.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Manyverse - A social network off the grid
TreeSize - TreeSize tells you where precious disk space has gone to.
data.world - The social network for data people
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.