Use your Raspberry Pi as a Home Theater Server.
The top dogs in the media server space now face some competition from Jellyfin, a relatively young project that impresses with a number of innovations.
Use Your Raspberry Pi as a Password Server
Passbolt lets you manage all employee access credentials with a single instance on a Raspberry Pi.
Retro Gamer
Play old DOS games on the Dosbian operating
system, which turns the Raspberry Pi into an 80486 PC.