Fyne - The Fyne toolkit is an easy to learn, free and open source, platform for building graphical applications for desktop, mobile and beyond.
Growth.Design Case Studies - Product tips… in a comic book format
Gio UI - Gio is an open source library for creating portable, immediate mode GUI programs for Android, iOS, Linux, Windows, macOS.
Zero to Marketing - Short case studies that help you get better at marketing
AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts
Case Study Club - Learn how people design digital products