Widely used survey creation platform. Qualtrics allows creation of surveys in many formats, which can be delivered via websites (including via sites like Mechanical Turk), email, SMS, offline, etc. They also offer survey-related consulting and research services.
Amazon Mechanical Turk is a platform where researchers can post surveys as well as a variety of mundane tasks that (currently or historically) are difficult for machines to perform(such as image classification and transcription),. In exchange, people all over the world are paid a little bit to complete the tasks.