Onesheet CRM - The Simple CRM for Google Sheets
SwipeWell - The only tool dedicated to helping you save, organize, and reference marketing examples (so you never feel stumped).
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.