Nifty - Manage projects, work, and communications in one place.
100 in 100 Challenge - Get 100 new paid users in 100 days
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
The First 100 - Proven framework for acquiring your first 100 customers
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
GrowthList - A crowd-sourced list of growth hacks