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HEY - Email at its best, new from Basecamp.
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.
IsMyEmailWorking.com - Round trip email test application.
Self Test by Ahead App - Receive anonymous & honest feedback on your social skills
Unspam.email - Email spam checker and newsletter heatmap prediction.
Matter - Create a feedback-focused culture in Slack with Matter!