SketchUp is a Windows modeling program that enables users to create, view and modify 3D objects. It consists of a style builder for customizing models, a layout designer and a powerful editor.

Capabilities

Push and Pull tool allows you to click on a shape and simply push or pull it to create your desired 3D geometry. With it, you can create complex forms quickly and efficiently. Additionally, you are able to experiment with color and texture directly on your models by applying various materials and styles. The in-built real time renderer helps you visually soften your drawing with rendering effects such as jitter lines, extended edges and dynamic profiles.

Flexible component architecture

You are able to organize geometry for convenient selection, while keeping it isolated from other lines and faces in your model. Moreover, you can double-click any object you want to edit. Once the items are placed, it is possible to modify all instances of a component in your scene simultaneously and interactively, without having to redefine them. It is also worth mentioning that you have the option to extend the core functionality by installing additional plugins like SketchUcam.

Features

free to download and use;
gives you the ability to create and edit 3D models;
compatible with modern Windows versions;
provides a wide range of design tools;
there is an option to install additional plugins;
can import schematics created by other users.