LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Meeting Scheduler By SalesBlink - The meeting scheduler syncs with your Google calendar and gives you a holistic view of how your day/week/month looks like.
SketchUp - 3D for Everyone
Planist - Schedule meetings in an easy way Planist can connect with your google calendar to automatically check availability and help you connect with your best contacts, prospects, and clients.
FreeCAD - An open-source parametric 3D modeler
Caddie - Caddie provides designers with all the tools they need to sketch, design, detail and visualise...