Language Switcher Dropdown is a very simple module that exposes a new block, similar to the default Language Switcher block provided by Locale module. The new block allows site visitors to switch languages using a drop-down select list instead of using hyperlinks.
There is a 8.x-2.x-dev development release of the module for D8, but it was last updated in 2013 and does not work with Drupal 8.0+.
# Project URL
# Where is the code?
There is an issue atwith an attempt to get the project partially working.
# Estimated completion date
# Who's doing the port?
# What help do they need?
# D8 roadmap
# Background and reference information