1. Freelancer
Freelancer (formerly GetAFreelancer) is the world's  largest  outsourcing and crowd sourcing marketplace for small business.  There  are 2,451,843 employers and freelancers connected globally from  over  234 countries and regions. Freelance projects cover fields of  software,  writing, data entry and design right through to engineering  and the  sciences, sales and marketing, and accounting and legal  services.
2. Joomlancers
Joomlancer is regarded as one of the best places for  Joomla  experts to get high paid jobs. Projects on Freelancers are  mainly  related to Joomla and Mambo, mostly customizing 
Joomla! templates   or developing extensions, but you still find other types of projects   here like design, translation or something like that. Joomlancer is said   to be less competitive compared to other freelance marketplaces, only   ten projects are posted daily yet the fee is quite interesting.
3. Elance
Elancer, based in California, has been available on  the World  Wide Web since 1999. Elancer tends to attract employers with a  higher  budget because of the 10% upload fee per project. On other  sites, they  normally offer free uploading. It might be good news for  freelancers  working in more developed countries like US or Canada as  they don't  have to compete with freelancers from less developed nations  such as  India, China and Vietnam. 
Generally speaking, Elancer is a good marketplace for employers with big budgets looking for quality freelancers.
4. Odesk
Odesk has an online tracking system, which makes it  stand out  from the crowd. This system checks employees' work every ten  minute so  that their work is assured to be under progress. This  freelance  marketplace is different from other sites, which is a good for   employers who prefer to pay per hour rather than by project. 
Odesk does not charge membership fees to providers. They charge   providers 10% of the project fee paid to them instead. Employers can use   Odesk for free. Also, Odesk has an online ticket submission support   form, which usually takes around one day to get the ticket request   submitted back.
5. Scriptlance
The most noticeable thing about
 Scriptlance is its  free  registration and free monthly fees. In general, this is a  competitive  marketplace with hundreds of projects posted every day and  thousands of  freelancers bidding. Scriptlance provides some withdrawal  options  including E-gold. Another good thing is its low commissions,  which is   only five percent of the project amount (minimal fee $5).
6. Vworker
RentACoder is now renamed as 
vWorker freelance  marketplace which  stands for "virtual worker". The reason is that   freelancers joining  this site are not only coders but also experts from  other  fields like  design, writing, assistants and more. Vworker has had  some changes,   one of which is the payment method called pay-for-time  that lets you do  both.  This method saves money and helps both buyers  and sellers have  more flexibility  in their work. 
The site has changed its domain with the resulting negative impact   on  the Google page rank of vWorker now (it's now quite low). Some  people  feel  hesitant about vWorker due to this reason. However, if  someone  has experience  with Rentacoder, vWorker is absolutely no  different in  quality.
7. Guru
Guru is one of the world's largest online  marketplaces for  freelancers with more than one million registered  members and more than  8000 projects posted monthly. This site focuses on  three main areas:  Technology, Creative Arts and Business but over 220  skill-based service  categories. The website was founded long time ago in  1997 and operated  in Pittsburgh, Pennsyvania now.
8. Project4hire
Project4hire is  free of charge for clients to post  projects and  for contractors to bid for  those projects. Only a small  fee is  withdrawn from the contractors' projects. 
You will find here OsCommerce Programmers, Wordpress  developers,   vBulletin skin designers, Joomla coders, Drupal programmers and    xHTML/CSS coders and more.You can also find translation services and    translation jobs. You can find plenty of freelancers in Project4hire.
9. iFreelance
In 
iFreelancer, registered  freelancers have to pay  membership  fees for the services. The basic membership  is $4.69 per  month, silver  for $6.95 per month and gold for $9 per month. The  higher  the  membership, the more benefits you get. Especially, freelancers  don't   have to pay a commission on what they earn. This site has got a  lot of  trust  from buyers and freelancers and built a strong  relationship  between them.
10. BizReef
Bizreef is an  Israeli owned Freelance Marketplace  launched in  October 2007 by MeVideo Ltd. The  coolest thing about  Bizreef  is that  it has  an Escrow system that guarantees that  freelancers will receive  order services  as well as protection of their  rights. The payment is  kept in Escrow and just  released after  freelancers approve their  delivered work. You can feel safe with   transaction. Plus, Bizreef  provides a bunch of projects every day that  attracts  many freelancers  in different parts of the world.
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