PLEX
PLEX or Plex may refer to:

PLEX (programming language), a special-purpose, concurrent, real-time programming language
Plex Inc., an American company that develops a client–server media player platform and streaming media services
Plex Systems, a software company based in Troy, Michigan
IBM Plex, an open source typeface superfamily
Pilot License Extension, an item in the video game Eve Online that adds game time to an account
Plasma exchange, a type of plasmapheresis where patient's blood plasma is removed and blood products are given in replacement
Plex, a robotic character on the children's television show Yo Gabba Gabba!