What are some alternatives?
When comparing BlueCAD 1.0 and Piglet Drawing Editor, you can also consider the following products
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
QCAD - QCAD is an application for computer aided drafting in 2D.
KediCAD - CAD/CAM/ FEA software for Linux
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
TigerCad - A completely free, simple technical drawing software (CAD)
Draft it - Draft it is a CAD software package that allows to create, save, & print work with drawing tools that allows to create professional drawings for project.