LeadDelta - LeadDelta will help you to grow, manage, and engage your Linkedin connections. Cut through the noise and create new opportunities in your network.
Hivoe - Engage with your audience on Twitter automating your Direct Messages
NetHunt CRM - Turn Gmail into a smart CRM
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.
THE BAMF BIBLE - 25+ Growth Hacks (Updated for 2019)
Front Twitter Inbox - Team inbox for Twitter