Promomatic - Easily create beautiful app store assets
App Launch Checklist - Planning tool for launching your app successfully
AppLaunchpad - Create free beautiful screenshots for App store/Google play
Startup Toolkit - Interactive how-to guides to launch your startup
DaVinci Apps - Сreate customized screenshots for your app in just 3 steps
How to Be a Manager - The step-by-step guide for leading a team