ESL Watch is a very useful website for teachers looking for jobs. Like Yelp or Trip Advisor it offers reviews of employers worldwide in the field of English as a Second Language. If you want to avoid a horrible job, checking this site can help you steer clear of the dodgy employers.
Like anything, you have to discern whether the reviewer is a hot head or the employer pretending to be a satisfied teacher. Despite this, it’s a step in the right direction.