Jeopardylabs.com is a free* website that allows you to build Jeopardy-style games. You choose how many categories and how many questions. This is a fun way to review and practice vocabulary, numbers, and very basic grammar.
*For a one-time (lifetime) subscription fee of $20, you gain the ability to upload images, videos and sound (if hosted on a public site such as SoundCloud or YouTube), and to make your games private. (Games made with free accounts are all public.)
Working with beginning-level learners, I use a lot of images for vocabulary practice, so the one-time $20 payment was well worth it.
The popularly-known Jeopardy game on U.S. television gives the answer, and then participants must identify and ask the question. For English learners, I reverse this: the question is provided and the learner gives the answer.
In addition to identifying vocabulary words from images, I use categories such as:
singular or plural?
name 3 [parts of the body, cities in Oregon, colors, days of the week, etc.]
what comes next? [10, 20, 30, ___; Monday, Tuesday, _______; March, April, _____]
starts with [a color that starts with B; a body part that start with H; a city that starts with V]
missing letters
how many syllables
Pros: Fairly easy to create games; easy to modify and re-use; flexible; can be played cooperatively (no teams), individually, or with teams; no ads (non-commercial)
Cons: For images and privacy there's a one-time $20 payment; you can only add your own audio or video if it's hosted on a public site such as SoundCloud or YouTube.