Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
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.
Roundcube - Web-based IMAP email client
Google Forms - Simple web forms from Google.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.