LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
QCAD - QCAD is an application for computer aided drafting in 2D.
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.