Career Engine lists job openings for a number of different fields. You'll find everything from English-teaching jobs to front-end developing and smart phone game design positions. The site conveniently notes the language requirements for each position so you don't have to waste your time browsing through job postings you might not be qualified for.

Jobs in Japan may look a little messy, but beneath the surface you'll find a treasure trove of job findings that you probably won't find on the other sites on this list. A quick perusal of Jobs in Japan shows unusual job openings, such as for football coaches, outdoor guides and product testers.

Craigslist might be a bit of a mixed bag, but its job listings, especially in the Tokyo area, are quite expansive. You'll find the usual teaching jobs and some rare gems as well, including writing jobs and other creative work.

Daijob is a well-designed resource with hundreds of jobs in a bunch of different categories. An advanced search option allows you to search by required language proficiency, location, and more, giving your career quest some efficiency.

GaijinPot's well-rounded jobs page has everything you need, and makes strides to avoid user frustration. The site allows you to store resumes and applications under your account, so you can return to them later if other life obligations crop up. The jobs listed on GaijinPot tend to mostly be teaching jobs, although you'll find some interesting listings in other fields too.