(English) US-based microtask marketplace run by Amazon.com, Inc. Oldest microtask marketplace.

(English) Germany-based mobile microtasking platform active in over a dozen countries in Europe. Most jobs involve taking photos of items in specific places, e.g., sales displays in stores, and pay between € 1 and € 15.

(English) German microtasking platform. Offers "full service" for clients who want to break down large tasks for crowdsourcing as well as "self service" platform.

(English) Germany-based content/writing platform.

(English) Germany-based microtask platform. Crowd Guru does not offer a “self service” platform; all projects are managed by an employee.

(English) US-based microtasking platform. Largest English-speaking microtask platform (according to 2014 estimates). Offers "full service" and "self service." Founded 2007 as Dolores Labs.

(English) Germany-based platform for design. The public section is contest-based; a private section pays designers a fixed daily rate to participate in projects.

(English) Germany-based microtask and freelance platform. Workers are students (or former students with university email addresses) in Germany, Austria, Spain, Italy, Denmark, US, and UK.

(English) UK-based platform, founded to recruit participants for academic microtasks, especially surveys and online experiments.

(English) Germany-based mobile microtasking platform active in several European countries.

(English) Germany-based software-testing platform. Initiators of the Crowdsourcing Code of Conduct.

(English) Largest English-speaking freelance marketplace, with workers in many countries all over the world. Formed in 2013 after merger of Elance and oDesk.