http://etherpad.org/

a highly customizable Open Source online editor providing collaborative editing in really real-time

https://www.inc.com/drew-hendricks/10-best-freelance-websites-to-find-skilled-contractors.html
Fiverr

Fiverr is the world’s largest marketplace for digital services. Fiverr enables you to browse the selection of freelancers offering services, and to place orders in just one click. A service offered on Fiverr is called a Gig.

AirTasker

Freelancers Services. Receive no-obligation quotes from reviewed, rated & trusted Experts in minutes.

Toptal

Toptal’s approach makes it a definite outlier compared to conventional platforms, as it’s geared towards custom-matching vetted, senior software engineers to clients with serious, compelling tech projects. Toptal is highly selective about its freelancers (roughly 3% acceptance rate), and offers a no-risk trial period on every engagement. Toptal’s impressive client list speaks for itself (Airbnb, J.P. Morgan, Zendesk, and more).

Upwork

With an escrow system that allows you to authorize payment releases once milestones are hit, Upwork.com offers an enormous pool of freelancers for everything from legal work to finance and management (including a few hundred thousand software developers).

Guru

With a membership program and a complimentary “Work Room” where you can oversee progress, define milestones, etc., Guru is a great option if you find yourself constantly in need of help on miscellaneous small jobs.

Freelancer

Freelancer is awesome for small businesses, and with over 15 million users, you’re sure to have hundreds of proposals from eager freelancers to compare in no time. It also allows you to post projects as contests and review large volumes of submissions while only paying for the one you like most.

Staff.com

In addition to its large talent pool, Staff.com is an open platform, so you can also find employees on other sites and use its services to handle billing, time tracking, etc. Unlike the other platforms here, it’s geared more towards full-time engagements.

Craigslist

If you need an on-site freelancer, Craigslist is a great way to find freelance talent in your community. Although you might have to read through a large volume of resumes, posting a job is inexpensive, and you can include specific application instructions to help weed out people who just apply to jobs at random.