LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
QCAD - QCAD is an application for computer aided drafting in 2D.
DualCAD - Freeware cad application that handles the basic needs of most Microstation users
TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).
High Design - HighDesign software is for architectural design, engineering, MEP, detailing, and construction.
JustCAD - JustCad is designed, to make cad drawing as simple as possible.