OpenSnitch is a GNU/Linux port of the Little Snitch application firewall

Disk Jockey, a disk image file maker for your retro stuff

Disk Jockey is an application for macOS and Windows that lets you create disk images that work in devices like BlueSCSI, Floppy Emu and PiSCSI / RaSCSI, as well as in emulators like Basilisk II and Mini vMac.