Hivoe - Engage with your audience on Twitter automating your Direct Messages
Cold Email Hacks - Proven cold email templates and tactics for B2B startups
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.
Cold Email Analyzer by Mailshake - Real-time analysis of email subject lines and copy
Left Unread - Never leave DMs unread again.
Mailshake - Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.