Aclipse is a great company to work with and go through to teach English in Asia. Their recruiters are knowledgeable and make the transition super smooth when looking to teach English overseas. It's a big commitment (at least a year and most people stay longer) so it's important that you choose the right recruiting company, and Aclipse is definitely it.
Kontras
It's hard to think of something to put here and as I only have fond memories with working with Aclipse.