Enable network game support

Packages describing “net” as local USE flag

Package “net” Flag Description
games-board/freedoko Enable network game support
dev-libs/poco Classes to write network clients & servers
games-engines/scummvm enable cloud support via media-libs/sdl2-net
mail-client/s-nail Enable support for network protocols (POP, IMAP and SMTP). If you only need to send mail with the local Transport Agent, disabling this will get you support for only /usr/sbin/sendmail call.
app-shells/bash Enable /dev/tcp/host/port redirection
sys-apps/hwids Install the oui.txt and iab.txt databases
app-forensics/quickfuzz support networking formats
games-fps/prboom-plus Enable support for network play

All packages providing a “net” USE flag (3)