Start on Android by Google - Developer program to optimize your app before you launch
Materia - Materia is a development environment to build advanced mobile and web applications.
Visage - Visage is a new platform that enables non-designers to easily create beautiful, on-brand visual content such as data visualization, reports & much more
Dark Language - Holistic language, editor, and infra for building backends
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.