The best replacement for gallery is museum.

The best alternatives to gallery are rated as following:
★★★★★  museum
★★★★★  coppermine
★★★  album
★★★  zenphoto
★★★  google photos
★★★  portfolio
★★  shutterfly
★★  picasa
★★  piwigo
★★  galleria
★★  balcony
★  album nextgen
★  exhibit
★  windows live photo gallery
★  professional frigidaire
★  professional series
★  openphoto
★  photos app
  set
  viewpager
  kenmore elite
  frigidaire
  gallery
  tribune
  windows photo gallery
  triforium
  quickpic
  whirlpool gold
  picassa

Your alternative for gallery is not listed? Suggest!
Speaking about gallery, one probably shouldn't forget about pier.

Other search terms related to gallery and their ratings are:
★★★★★ pier
★★★★ lightbox wordpress
★★ cms
★ magic gallery
You have in mind a companion for gallery and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gallery in all years. Click on graph for more.
gallery
museum
coppermine