Campnab - Nab that sold-out campsite!
FreeCAD - An open-source parametric 3D modeler
Aerial Camping - Discover campgrounds from the sky ⛰
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Hipcamp - Book unique camping experiences on over 300,000 campsites, cabins, RV parks, public parks and more.
SketchUp - 3D for Everyone