TextadeptViewer

You can configure Textadept to be a "viewer" showing no menubar and read-only view.

In your ~/.textadept/init.lua:

args.register('-vm', '--view-mode', 0, function()
  -- Make all opened buffers read-only.
  events.connect(events.FILE_OPENED, function()
    buffer.read_only = true
  end)
  -- Hide the menubar.
  textadept.menu.menubar = nil
end, 'View-only mode')

Then call Textadept from the command line like this:

textadept --view-mode foo.lua bar.lua -e 'buffer:goto_line(9)'