What are some alternatives?
When comparing BlueCAD 1.0 and DeltaCAD, 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.
JustCAD - JustCad is designed, to make cad drawing as simple as possible.
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
Piglet Drawing Editor - 2-D engineering drawing editor that supports hierarchical object description
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.