Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
FreeCAD - An open-source parametric 3D modeler
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming