Scrapy - Scrapy | A Fast and Powerful Scraping and Web Crawling Framework
Qualtrics - Qualtrics is the most trusted research platform, helping brands make crucial business decisions. From surveys to insights to action.
StormCrawler - StormCrawler is an open source SDK for building distributed web crawlers with Apache Storm.
Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
Apache Nutch - Apache Nutch is a highly extensible and scalable open source web crawler software project.
Clearbit - Clearbit provides Business Intelligence APIs