WriterBay / Job
Started working here 2 years ago and working till now. As a part-time job it has its advantages:
-ability to work from home and take cases when it is suitable
-easy job to do (write simple essays)
On the other hand, there are disadvantages, such as night revisions and picky clients. Sometimes it takes a while to explain that client is actually wrong and writer should get the additional payment for extra work.
All in all working here is not a complicated thing to do and it allows to earn a good money online. I would recommend it for calm and patient writers.