We should perhaps say fun learning activities instead, as some students (and some managers) do get turned off by the word games. But whatever you call these activities, a bit of fun, competition and team work can be a powerful motivator for learners.
Here is a selection of grammar, vocabulary and prepositions board games.
The question cards require some cutting up, but you'll want to use them again and again.
Read more: Board games
Here is a selection of board/card games for practising speaking skills, particularly fluency.
Read more: Speaking games
There are lots of free websites with vocabulary or spelling games which are suitable for EFL students. Here are some of my favourites.
Read more: Word games
If you have an interactive whiteboard in your classroom, try these PowerPoint games. Some are ready to go, some need you to type your own questions into the template.
Read more: PowerPoint games
Follow this link for a paper version of the Blockbusters game, suggestions for words and a PowerPoint version you can use with interactive whiteboards.
Read more: Blockbusters (ABC quiz)
This page is a work in progress for games which I couldn't decide how to categorise.
Read more: Other games